Body changes after loosing virginity

I had sex for the first time a few weeks ago and a few times since then. we used condoms every time and now I'm ovulating this week. I noticed that last week and this week I keep having these wierd feelings in my hips and my boobs are kinda sore but not really in a period-sore way. They say your hips widen and your boobs get bigger after the first time. Is that what it is and Did anyone else expierence this?