missed period?

Hey awesome supportive community :) I started the pill this month and have taken all of them with a 1h delay at most. i've been bleeding all month, especially after sex, but now, on the fourth day of Placebos I have still not had a period start. I did have sex without a condom (but withdrawal) in the third week of the pill. Is this normal and should I be fine? Do I have to take a pregnancy test before starting the new pack?