Have you gained weight? It might be brought about hormonal imbalance. Might as well visit an ob gyne to check your status. It happened to me once, and it is due to hormonal imbalance since I became overweight. My OB prescripted a drug to normalize my menstruation and advised me to lose weight.
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It can be because of the pills or it can be just too early to detect if you're pregnant. I suggest that you wait a couple more weeks before taking another pregnancy test or better yet consult an ob-gyn to make sure.