It is all about the hormones.
Throughout your pregnancy, you may notice that your sex drive begins to change: some days you may feel very sexual, while other days cleaning the grout in your shower sounds like more more fun than getting between the sheets. These changes are entirely normal and are often a typical part of pregnancy. So whether your sex drive is up or down, don’t worry – there is nothing wrong with you.
Sex Drive in Overdrive
Many pregnant women report that they actually experience a dramatic increase in their sex drive during pregnancy. This is typically due to the change in hormones that your body goes through when you are pregnant.
In order to support your pregnancy, your body increases the amount of progesterone and estrogen in your bloodstream. As a result, you may feel the need to be with your partner more than usual. This increase in hormones has a number of physical effects on your body, which can often make sexual intercourse much more enjoyable than usual. These changes include:
increased vaginal lubrication
increased sensitivity of the breasts and nipples
increased blood flow to the pelvic area
Some women also report that they feel sexier during pregnancy. Those added curves around your hips, breasts, and stomach can contribute to an increase in your sex drive.
You may offer him the opportunity to use a surrogate while you are dealing with your pregnancy. (That way, you won't have to deal with "cheating" issues)
Good Luck, and congratulations!