Pain during sex

So i wanted to write this in the IUD section because i have one. I’ve had it for like a year and half, always been fine I’ve had some scares but that’s just me being paranoid. But last night i had sex with my boyfriend and i got pain that i haven’t gotten before right under my stomach on the right side looking down, when you look at me it would be your left. This pain only happened when he went in deep. I checked my IUD stings a couple of minutes ago to make sure they were okay, they feel okay, one string doesn’t feel as hard as it usually is, it seems to be curled from what i can tell with my finger. I know the strings curl a lot but i just wanted to make sure. Do you think it’s worth getting it checked, or am i being paranoid?