If there is a chance i could've gotten pregnant while on my period but the period continued, did fertilization occur?

See your Doc...: If your periods are normal and regular, its not possible to become pregnant while on your period. If you are confused about what is going on because you are having unusual bleeding, its best to get checked out by a doctor. Unexpected things can happen. For example, you could have become pregnant last month and the strange bleeding you are having now could be a miscarriage. Best wishes!

Period: Not all bleeding is your period, so yes it is possible to conceive while bleeding. It sounds like you have irregular cycles and spotting, which makes it even more likely.