If I had intercourse on the day my period was SUPPOSE to come and I'm a couple weeks pregnant, what would be considered my last normal period? If I use last months, I would be considered a month into my period.

Your post is a bit confusing. You're a month into your period, or a month late for your period? Being a month into your period would mean you've had your period for a month.

Are you in fact pregnant, or are you trying to find out when to test, or if you are pregnant? Is this a question about paternity?