So me and my boyfriend have been having sex a couple times a week for the past 3 months and I got my IUD over a year ago. He pulls out about half the time and we don't use a condom. About two days ago we had sex and he didn't pull out but it was probably the best sex we've had in a while but now I'm noticing cramping as if I was on my period. I just ended my last period about a week ago so I don't know what it could be. Is this normal? Could I be pregnant? I'm worried, please help!