Fever & boobs are sore etc

Me and my boyfriend have had sex 4 days in a row but he claims he pulled out each time I'm 22 year's old

I have a fever and my boobs have been hurting , burning and my nipples have been sooo sensitive and they have never i my life ever hurt burned or been sensitive.

My 4 day's are also new to me as i was a virgin.

What could this possibly mean? I don't think someone could show signs of pregnancy in 4 day's.