Could i be pregnant?

First of all, I’m not on birth control. I have this pregnancy scare now because 3 days before my ovulation week I gave my bf a bj and he came on my hair.

I took a bath to get the sperm out of my hair. Then I had this weird thought that the sperm from my hair would mix with my bath water and would swim into my vagina 😳 is that even possible? Should I worry? My breasts hurt right now and it says on this app I’ll be having my period in 8 days. I’m so scared, please help!