The body undergoes so many sudden hormonal changes to support the baby, which unfortunately causes constipation. Just please be gentle with yourself and don't strain too hard; ask your doctor for a pregnancy-safe stool softener if needed.
It is mostly because of the pregnancy hormones that slow down your digestive system. I remember crying on the toilet during my pregnancy, but now that my boy is a toddler, I can tell you it is completely temporary!
Hormonal changes are the main cause, but if you have thyroid issues like hypothyroidism, it can slow down your digestion even more. Keep checking your TSH levels regularly and let your doctor know if it gets severe.
Actually, it's a mix of progesterone hormone and those heavy iron supplements we have to take yaar. Try to drink lots of water and eat raw fruits to get enough fiber.
Your intestines basically go on a vacation because of progesterone, and the baby pressing on your stomach doesn't help either! Between diaper changes and zero sleep now, I almost miss those quiet (though painful) bathroom sessions, haha.