There are no medical reasons to not have sex during a normal, healthy pregnancy. Still, you and your partner may have shifts in your desire for sex. Your partner's changing body and the stresses of pregnancy make it important to talk to each other about your needs.
During the first trimester of pregnancy, your partner's likely to feel nauseated and exhausted. Their breasts may be quite tender. Your partner may not look like they're pregnant, but these are the months they may feel the worst. If you have been trying hard to get pregnant, one or both of you may want a short break from sex.
Many people who are pregnant report feeling their highest sexual desire during the middle three months of pregnancy. These months are often the most comfortable time.
Your partner's physical changes, however, are becoming more obvious now. You may not feel as attracted to your partner. You may worry about hurting your baby or feel like you are in bed with a third person.
If you two have had a previous pregnancy with preterm labor, miscarriage or other complications, you may feel especially sensitive and protective.
As the last trimester of pregnancy progresses, sex can be challenging simply because of the size of your growing baby. Finding positions that are comfortable can be an adventure. Your partner may feel unattractive and large. They may worry that an orgasm might bring on labor. If your partner is not sleeping well, they may have little energy for sex. Look for other ways to pleasure each other.
Even if you have sex less often, both of you still need closeness and touching. Think of other ways to express your affection. Help each other relax with a massage, or a hand or foot rub. Snuggle, hug, kiss. Share what you find most appealing about each other.