Inclusion Criteria:  Age ≥ 18 years Confirmed pregnancy Diagnosis of Gestational Diabetes (GDM), Type 1 Diabetes Mellitus (T1DM), or Type 2 Diabetes Mellitus (T2DM) Willing to wear up to the required number of Systems for the total duration of study wear Able to follow study procedures; Able to speak, read, and write in English or Spanish.  Exclusion Criteria:  Extensive skin changes/diseases that preclude wearing the required number of Systems at the proposed wear sites Known allergy to medical-grade adhesives Hematocrit outside specification Prescribed drugs for treatment of pre-term labor or experiencing high-risk pregnancy complications during current pregnancy Currently receiving dialysis treatment or planning to receive dialysis during the sensor wear period Currently using Hydroxyurea for treatment Require a Magnetic Resonance Imaging (MRI) scan, Computed Tomography (CT) scan, or diathermy during the sensor wear period