period help please?

Hi. I am getting a little worried because I haven't had my period this month yet. My last period was February 20.  Actually in February I had two periods. The there was a week in between the them. And the second one was February 20, like stated above. I had sex in between, but with protection and we checked to see if the condom broke, but it didn't, so And I was just concerned. Please let me know what is going on.