I am 28 yr old woman and my spouse is 42 we are trying to conceive I had intercourse on day 9 of my cycle and again on day 18 and 19. My nipples are tingly and my lower back hurts but I'm scared it could be pms seeing as how it's due on the 15th...

You will have to wait until your period is two weeks late before you can take a pregnancy test using first morning urine.

The waiting is always difficult, but unfortunately that is all that you can do. How long have you been trying? Have you looked into ways to help you get an idea of when you might be most likely to ovulate?