ADVICE PLEASE HELP

Okay so , I’m so scared . So I’m 17; LESBIAN. And me and my gf have been having sex once a day for the past like two weeks , it’s been two days since we last had sex . But I’m scared . Because I’m supposed to start my period yet have no signs of it . And we’ve had sex in the shower , and we’ve had sex without her washing her hands , could she have possibly touched semen from anything in the shower before fingering me ? Can I be pregnant ? IM SO SCARED . Ive been eating ALOT today ? And idk if it’s cause I’m GONNA start ? Or if it’s Bc she could’ve touched semen and nowww yk? I overthink and probably sound very stupid , but I’m truly concerned.