someone help !!!

Logan

okay so i had sex with someone on January 3rd, my period was suppose to start on the 1st but it didn’t & still has not! Now i’m 98% sure there is no way i’m pregnant due to the fact that i told him i wasn’t feeling in the mood anymore and i just couldn’t fake it, so he pulled out, and we finished by giving him oral, so that he could finish. Now, the only contact ive ever had with sperm was when i swallowed, and yet for some reason i still haven’t started my period. However it might be important that i mention this is the second time i’ve had sec with him, and the first time i ended up having a yeast infection afterwards. Can someone please explain what the hell is going on ????