Pregnancy is a risk factor for constipation. Many of our patients with constipation complain that it worsens with pregnancy. In these cases, they may have to take laxatives to help with the constipation symptoms.
Usually, we choose simple and safe laxatives that stay only in the gut and do not enter the body per se. for example, a stool softener like lactulose. Simple lifestyle measures are crucial, including adequate water and fibre intake, and regular exercise.
Senna and other laxatives do not affect fertility. Senna appears to be safe and does not appear to harm the fetus in animal studies. However, there are no human studies to verify its safety. Hence, it is not our preferred laxative in pregnancy.
You may want to consider a formal consultation with a gastroenterologist regarding constipation. It may be useful to understand the type of constipation you have so that the lifestyle measures can be more precise.
Regards