Irregular periods.

I've been TTC for two months. I don't get regular periods and that makes it even harder for me to track things down. I bought the Clear Blue ovulation kit but after the 2nd day of testing I got a blinky face for like 7 days. I bought another one and the 1st day was nothing 2nd day again blinky face but 3rd day a solid face...what should I do?