not sure what's wrong

So my period is not due until next Sunday but we had sex on ovulation day and the day before and 2 more times that period...well my boobs are hurting so bad for the past few days and my stomach has been a little bit crampy...I did start a job at a Salon with 15 woman so I'm not sure if it's from that or i am pregnant...I took a test tonight and it said negative...do you think I should wait to take another one or I'm probably not pregnant?! I hope we are!!! but I just don't know