I'm 40w 2d, wiped and there was a tiny bit of red blood,  I did have sex last night, but I've had sex this whole pregnancy and never spotted afterwards so idk,  and is spotting after sex red blood or pink?   It wasn't mucusy so I don't think it was my plug plus I think I already lost that, should I be worried since the blood was red? I also am having period like cramping and dull back pain.