I would wait closer to the end of the month too. Medical speeking there is only a few days a month that you can conceive. I never understood this when I was going through infertility to get pregnant. Are your breast sore or swollen? Not trying to get to personal, but with all 3 of my pregnacies that was my first sign. I have had many false pregnancys, they are like the real ones down to the tee.
If you are having an abnormal period, go see your gyn. I wasnt late yet with my daughter, but was having female problems. My pg test was neg., but they said my cervix was slightly inlarged. Thought I had an infection, gave me meds. I through my script away, refused to by tampons and found out 2 weeks later with a hpt, I was expecting.
I wish you all the luck and I too would love to know the turn out...