Need Some Advice?? Ladys

Does anyone else experience pelvic pains and backpains after sex??? I had my periods on the 11th of march and I had sex on the 1st of April and this <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> I'm using is saying I ovalate on the 4th of April. 🤷‍♀️