Why did this happen ?

So, I have been on the IUD since March of 2017. (I have a 1 year old daughter) me & my boyfriend, do not want any children (well i want one he doesn’t). So recently we had sex, & it wasn’t really painful, but certain positions he would go deep in, kind of hurt. (It had me running a little 🤒). Now normally it doesn’t hurt at all, I guess he just went a little deeper than normal.. 🤷🏽‍♀️ well we don’t use protection.

Could my IUD have slipped? Any ladies have this issue before with an IUD?

(& I just found out looking at my ovulation apps, that I was ovulating on that day & i just found that out today)

Could I possibly be pregnant ?