it can take 3 months for pill to get oput of body so that is probably why no period yet
The weird period two weeks after your first is probably just your body adjusting to coming off the pill.
If you had unprotected sex and were not taking the pill, then yes you could be pg. Take a hpt. If negative, take a hpt once a week until you get your period or until the test is positive. If you don't want to get pg, then use condoms or ask your doctor about other bc options.
Good luck!