Iud, NOT wanting to be pregnant

I need anyone and everyone to calm me down. I’m a college student and really do not want to be pregnant. I’ve had sex twice unprotected. Once was in October (middle) and to be honest I’m not sure if he pulled out. Second was very recent, november 18th. With my iud I do not get my period. I for some reason am scared that I’m pregnant. I took a test 2 weeks after the October one and it was negative. I took another one 3 days ago and it was negative. My boobs hurt, nipples are getting bigger, boobs are getting bigger, I’m bloated and nauseous, and am cramping. I obviously can gain a little weight being in college and not working out but are these normal? Is my chances getting pregnant from a guy pulling out and most likely pulling out while having an iud that high?