Usually, a woman doesn't suspect she is pregnant until her period is two weeks late - by which time the embryo may have been implanted in her uterus for three weeks and its heart is already beating. From the eighth or ninth week after the last menstrual period, an experienced doctor can be pretty sure that conception has occurred. Upon physical examination, the doctor finds the uterus that is already rounder, plumper, and softer than normal, as well as the cervix that has become bluish in color because of pelvic congestion. At about the same time, the pregnant woman herself may notice that her breasts have become heavy and tender, with sensitive, tingling nipples. Some women experience a sense of fullness of the abdomen and morning sickness.
Morning sickness is a misnomer.
It can occur at any time of the day or all the time. Its worse on an empty stomach. Frequent small meals of nongreasy foods, plus a few dry crackers and a glass of milk from time to time between meals, seems to reduce the queasy feeling. If that doesn't work, wait. Morning sickness almost always goes away before the fourth month.