[IzzyIzzyIzzy]

I did my research and am in a similar situation, except I had sex unprotected for like 5 minutes and then finished the other 25 minutes protected (sorry for the details, just trying to give some advice) Sure, sounds really stupid. Like i said, DID MY RESEARCH. Precum comes from a different gland to semen, therefore does not contain sperm UNLESS he has ejaculated earlier than day and some sperm is still in his urethra. Then that can be taken our WITH the precum, but is not actually originally in it. Usually if he pees after the first ejaculation it should clear it.
Best thing to do is take a test, and if your period still doesn't come take another one. If you're negative both occasions perhaps see a doctor or if you are prone to irregular period and have already seen a doctor, maybe just wait or book another appointment.
xxx