pregnancy scared

I'm super anxious. so I'm on the combined birth control lessina, which i started about 9 weeks ago, on the second day of my period. a couple days after I started, my bf and I fooled around and had oral, but he ejaculated on himself, nowhere near my vagina. he wiped it off then we made out and he went down on me.. my withdrawal bleed came again 3 weeks ago on my placebo pills. also i took preg tests at 5 and 7 weeks after the incidentand they both were negative. despite all this I'm still worried!! I haven't been nauseous at all but I have been having acid reflux some lower abdominal cramps. also my breast veins are more prominent. I know it's not possible for me to be pregnant, but does anyone have any suggestions to ease my anxiety?