I've been reading up a lot on this because we are planning too! Apparently, the ligaments stretch quite a bit, which causes mild period-like cramps. Let us know what your doctor says when you ask them!
In my early months, I used to get mild cramps like periods, which was just the baby settling in nicely. Keeping yourself hydrated helps a lot with these cramps. Just remember, if the pain is continuous or sharp, check with your doctor immediately.
I also had mild tummy pain and my doctor said it was normal stretching, but because of my thyroid, I kept regular follow-ups to be safe. You should definitely mention this pain to your gynac during your routine checkup.
Arey, baby is basically doing some home renovation inside your stomach, so a little stretching pain is bound to happen! Just sit back, don't lift any heavy things, and get your husband to pamper you. But yeah, if it hurts too much, call the doc.
Mild stretching pain is quite common as your uterus is expanding to make space, but I know how uncomfortable it gets. Try lying down on your left side and resting for a bit. But if the pain is severe or you see any spotting, please call your gynac immediately.