45 days pregnant may have early pregnancy reaction, breast changes, frequent urination and other reactions. 1. Early pregnancy reaction: it is caused by the elevated level of hormones in the body of pregnancy, mostly in about 6 weeks after menopause, which can be manifested as vomiting, nausea, acid reflux, fatigue, anorexia, drowsiness, etc., and some pregnant women will also have mood changes, such as irritability, etc., generally do not need special treatment, and it will mostly disappear on its own when it is about 12 weeks after menopause. 2. Breast changes: due to the rise in the level of estrogen and progesterone in the body after pregnancy, the volume of the breasts can gradually increase, pregnant women may consciously breast swelling and pain, while the nipple and areola hyperpigmentation is obvious, around the areola can also appear dark brown Montgomery’s nodules. 3. Frequent urination: caused by the increasing uterus pressing on the bladder after pregnancy, which will disappear naturally after the uterus protrudes from the pelvis.