In need.

So I'm a virgin. on October 22nd my man came on my stomach in the shower due to a handjob and it dripped down to my vagina. can you get pregnant if your man cums on your stomach in the shower and some drips down to your vagina?? i took a pregnancy test a week after (on that Sunday October 30th) and it was negative. Then on November 2nd i started my period. It was four days early. I don't know why but I'm still freaked out i could be pregnant. I started taking birth control pills exactly two weeks ago, so my hormones have been crazy. Could I still be pregnant? I feel crazy. I don't know why I am still afraid I am.. what is wrong with me! I feel so alone.