I'm not sure why the previous poster is advertising Depo for this issue. Depo has many serious side effects, like any birth control shot or pill, and it doesn't prevent pregnancy 100%. There are many women on this site that got pregnant while using Depo.
But, having said that, it could be that you're just stressed, or having an off cycle a few times in a row. It could also be that something is medically wrong. Could be a cyst, a tumor, a fibroid, etc. etc.
Fact is, we can't give you a diagnosis. I would definitely book an appointment with your Gyno to find out if this is something serious.
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