I did not take Seasonique so I had my periods during taking the pill. However when I stopped to get pregnant with my son I didnt get my period for 4 months then I got sick and found out I was pregnant. I was not four month along I was just barely prego by only 5/6 weeks.
Then I got back on the pill after my son my periods were crazy and all over the place. I stopped taking them again because I couldnt take not knowing when and how my periods were going to be. My husband and I decided to use condoms but didnt like them so we said if we get pregnant than that was fine too. We were not really trying but we were not avoiding it. After I quit taking the pills that time I missed my period for 3 months. I kept thinking I was pregnant kept taking tests. Then found out at the end of the 3rd month I was prego again. Again I was about 5/6 weeks. It was a week before my sons 1st bday.
So until you get your period back on track. Go to the dollar store stock up on some tests. They really do work. They are what I used both times I got prego. It is nice to have them on hand to ease your mind. Also the stress about worrying if you are or can get pregnant can lead to missed periods.