Me and my wife has had unprotected sex, right now she is a whole month late with her period, but the pregnancy test says she's not pregnant. help me?

Pregnancy: Go see your doctor and ask to do blood test for pregnancy which is more accurate.

Repeat the test: Presuming you have a healthy sperm count within the sperm reference interval of your laboratory and the timing of your intercourse was within a few hours of your ovulation, you are expected to have a positive result precluding any anatomic abnormalities of the uterus or genetic defect of either the sperms or the egg.