hey, possibility of a false positive is almost impossible. Because the home pregnancy tests detect a hormone called HGC tht is only present when you are pregnant. Now, if you had sex on Halloween, the test should not show up for another week. The best thing to do is to go to the doctor immediately, and get some bloodwork done. The fact that she is taking medication for her infection is not helping your situation. Tell her to drink lots of liquid, and cranberry juice. Most women do not start the symptoms until later on (around 5th-6th week) of their pregnancy, that's when morning sickness hits you. I used to get urine infections all teh time, just because I was very active at one point, and the best thing to do to prevent that is to go and pee after sex, the amonia in the urine will disinfect what the male body has brought to the females. Remember that by no means could peeing prevent pregnancy. Go to the doctor, and Goodluck. Please be patient, I know its hard but support her as she will be needing it the most right now.
