Can I be pregnant (stupid question)

So I have the paragard iud and my strings are in place. I had unprotected sex with my SO and he has cam inside multiple times. I’ve had sex while on my period and around my ovulation. I don’t feel pregnant but I’ve been spotting non stop since my period off and on. I’m on blood thinners so pregnancy can kill me. I’ve had this happen when I got my iud a couple of months ago but over time my period had kinda become normal. this is my first time having sex while on brith-control so I don’t know if this is normal to spot randomly as my period dies down. My obgyn doesn’t think I could be pregnant and I’m sure I’m not but there’s always a horror story with iuds