Patient description: A 42-year-old healthy woman came to the clinic to have her flu shot in early October. She works in a rehab center and has no underlying disease. It's her first time getting the vaccine this year. She is married for 5 years and uses barrier methods of contraception. Her menstrual cycle is irregular. She does not smoke. She is not on any medications. She exercises regularly for 30 minutes a day at least 5 days a week. She has no history of allergies to any food or drugs. Her past surgical history is significant for tonsillectomy and she is otherwise healthy.

Clinical trial eligibility criteria: eligible ages (years): 18.0-40.0,  Tubal Patency i. Women between 18 and 40 years old ii. In good health, with regular menstrual cycles that occur 24 days iii. No current use of hormonal contraception or an intrauterine device and having had at least one complete menstrual cycle since having stopped hormonal contraception before starting the treatment. iv. Have a negative urine pregnancy test at the admission visit. v. Have a negative chlamydia test at the admission visit. vi. Not be at risk for pregnancy. They will be consistently using a non-hormonal contraception method, have a surgically sterile male partner with a vasectomy, be abstinent, or be in a same-sex relationship from the screening visit through the first study cycle. After starting the combined OC (see Visit 4 below), use of a non-hormonal method is no longer required. vii. In the opinion of the investigator, willing and able to follow all study requirements, including use of the approved study medications (doxycycline, oral contraceptive and DMPA). viii. Understand and sign an IRB approved inform consent form prior to screening activities. ix. Will have diastolic blood pressure (BP) ≤85 mm Hg and systolic BP ≤145 mm Hg after 5 minutes in sitting position. x. Agree not to participate in any other clinical trials during the course of this study  i. Women with menstrual cycle length of less than 24 or more than 37 days; or with spontaneous irregular menstrual cycle length with intra-individual variations of more than 5 days ii. Currently pregnant as confirmed by positive high-sensitivity urine pregnancy test iii. Women planning pregnancy within their months of study participation iv. Currently breast-feeding or within 30 days of discontinuing breast feeding v. Current use of a hormonal IUD, or other hormonal contraception (including oral contraceptives, contraceptive vaginal rings, contraceptive patches, or contraceptive implants) within 30 days prior to screening. NOTE: Discontinuation of hormonal contraception or removal of implanted hormonal contraceptives must have been for personal reasons unrelated to the purpose of enrollment in this study. vi. Undiagnosed abnormal genital bleeding vii. Known hypersensitivity to radio-opaque contrast, doxycycline, levonorgestrel, ethinyl estradiol or depo-medroxyprogesterone acetate. The active ingredients in the approved medications used in the study. viii. Anomalies in the clinical exam or history done at screening visit recognized as clinically significant by the investigator. ix. Unable to pass a uterine sound at the screening examination. x. A positive test for chlamydia at screening, or a history of a positive test within the last 6 months. xi. A clinically significant Pap test abnormality, as managed by current local or national guidelines that would require treatment over the next 6 months. xii. Invasive cancer (past history of any carcinoma or sarcoma, except non-melanoma skin cancer) xiii. Body mass index (BMI) >35. xiv. Current use of a non-hormone containing (copper) intrauterine device (IUD). NOTE: Removal of an IUD must have been for personal reasons unrelated to the purpose of enrollment in this study. xv. Smoking if > age 35. xvi. Personal history of venous or arterial thrombosis or embolism, or family history in a first-degree relative <55 years of age suggesting familial defect in blood coagulation system, which in the opinion of the principal investigator, suggests use of a hormonal contraceptive could pose a significant risk. xvii. Cerebrovascular or cardiovascular disease. xviii. History of retinal vascular lesions, unexplained partial or complete loss of vision. xix. Headaches with focal neurological symptoms. xx. History of cholestatic jaundice of pregnancy or jaundice with prior steroid use. xxi. Use of liver enzyme inducers on a regular basis. xxii. History of involuntary infertility, pelvic inflammatory disease (not followed by a normal pregnancy), or known gynecologic conditions or surgery that could affect tubal patency (e.g. tubal adhesions, endometriosis, hydrosalpinx, salpingectomy, hysterectomy, oophorectomy). xxiii. History of a prior HSG showing tubal occlusion on one or both sides