It is usually safe to have sex during pregnancy. The only exception is if your doctor has advised against it. However, it is quite normal for your spouse to undergo wide variations in her sex drive during her pregnancy. While there are no hard and fast rules, your spouse’s willingness to have sex may be influenced by the stage of pregnancy she is in.
First trimester: Pregnant women, especially in the first trimester, experience morning sickness with symptoms such as exhaustion, weakness, and nausea. This phase is also marked by increased sensitivity in the breasts and the frequent need to urinate. Unpleasant symptoms such as these may be responsible for the lowered desire for sex in the early weeks of pregnancy.
Second trimester: Many women begin to enjoy sex during the second trimester, once morning sickness symptoms start to wane. Generally, pregnant women experience an increase in the amount of blood flowing to the clitoris. Pregnant women also experience an increased level of vaginal lubrication. Due to these reasons, some women find sex especially rewarding during pregnancy.
Third trimester: At this stage in your spouse’s pregnancy, her growing belly may lead to increased pressure on the abdomen. This may also restrict her mobility. Thus many women experience a lowering in their willingness to have sex during the advanced months of pregnancy.