Need an answer. Just think im paranoid real bad lol

Okay so my Bf and I had sex about 3 weeks ago without a condom and the second time he exploded in me. Now last week my period didn't come on for two whole days and then it did. Do after my cycle was done about 3 or 4 days later I've started to feel really nauseated and have been until today but yesterday I was and had lower abdominal pain. So out paranoia I took a test but of course its to early to really find out but it was negative os I was relieved but I'm still worries as crap right now so really need some feed back on this and help so ladies please just tell me everything no beating around the bush nothing just be 100% honest I don't care how bad it may be I'm just really nervous on being pregnant I'm not mentally ready yet