Help?

Emily • XXVI-X-MMXIII • taurus • good vibes❥
I'm TTC and I think the reason why I haven't  became pregnant is because my cycle is really irregular. My period is over a week late and I just took a pregnancy test to get none other than a BFN. Is there anything I can do or get over the counter to help regulate my cycle? I currently have no insurance so I can't go to my OB/GYN for help. Thanks ladies!