I had sex last month on September 14. He used a condom & I got my period on September 17. A month has gone by & today is September 17 & I haven't gotten it yet... I know I'm probably overreacting I just need a reliable answer... HELP PLEASE

You are overreacting. Why are you assuming that your period comes on the 17th of every month? Even if you were regular, months have different numbers of days. And even regular women are often off schedule.

This is not to say that you aren't pregnant. Any fertile woman who has sex can be pregnant, even if she has a period.

If you had sex a few days before a period, yes you would normally have that period even if pregnant. So could you be pregnant ? Yes you could be.

But next you will not come on the 17th of each month, just the different number of days in a month will make that vary. And some women have 4 week, others maybe 5 week cycles.

Most likely it will just come in a few days, if not, you will have to wait about two more weeks and try and home pregnancy test, using first urine of the day