I'm 9 Days Late & I've Been Having A Lot

I'm 9 days late & I've been having a lot of pregnancy symptoms like, burping, diarrhea, headaches, lower stomach pain, being tired all the time & mood swings like crying a lot...but I've taken many pregnancy test before & all negative. I just don't understand if I'm not pregnant then what's the deal? But I did have sex with my boyfriend 2 weeks before my period was supposed to start, which I knew I was ovulating because I ovulate on the 18th day of my 32 day cycle. but we were messing around & he'd put his penis in & just before he would cum, he'd stop & put a condom on. so can you get pregnant from precum? I've googled it & it said you can but chances are low. I feel pregnant. But I just dont know, when should I take another test??