Pain at top of uterus

I'm 31+1 weeks and for the last two days I have had this pretty constant stretching/tearing type pain that's not severe or intense but it's at the top of my uterus that doesn't hurt when pressure is applied but I can feel it and it's kinda just always there, I'm not having any cramps or bleeding but I'm just kinda concerned that it could be my placenta? Anyone else have this kinda pain. I'm a FTM and I don't know what's normal.