Should i still expect a period if i took plan b every week for a month and bled 2-3 days every week? i'm feeling very exhausted lately as well.

Take regular BCPs: You have exposed yourself to high and sporadic doses of progesterone. You might be exhausted due to anemia. Your period will be off for while due to the irregular exposure to progesterone. It would be better for you just to take a regular daily birth control pill (BCP). That way you will only bleed when you reach the end of the pack. It's also a lot cheaper that paying for Plan B multiple time