Is it normal to feel hardening in the lower stomach after sex

Hi mama! That hardening feeling you're experiencing could be Braxton-Hicks contractions (practice contractions), which are pretty normal especially if you're pregnant, they can definitely happen after sex or physical activity. But since you're concerned about it, it's best to check with your OB just to rule out anything else and get peace of mind, especially if it happens a lot or comes with pain or spotting.