So I had a period around the 28th of February and finished in early March (my periods usually come around the 21st). It's now the 19th of April and I still haven't received my March period. Could this be due to finishing in March it's just counted as a period for that month also? Please help. I have took pregnancy tests and they say negative but not having my period doesn't add up as I have always been regular every month, never missed one.