I Recently Had Relations With My Boyfriend And It Had

I recently had relations with my boyfriend and it had been over 7 years since I had been sexualy active. I was with him for 4 nights every since the last night we were together I feel very bloated, with minor cramping. He's been diagnosed 93% sterile and I had been off my period for 4 days before intercourse. It does feel as if pregnant but is that even possible, plus its to soon to feel this way. It hasn't even been a week since last together. Why do I feel so bloated after relations? Surely after 4 days this sensation should have past, right?