My peak day was aug 30th, I had unprotected sex that day & 2 other days in my fertile window. My period was due sept 9th & I still haven't had it. I got a neg test on the 12th. I sometimes have irregular periods so I don't worry, but this time I am having heavy discharge, back ache, sore itchy nipples, a heaviness & tugging/flutter in my tummy I've never felt before. Also sneezing... Help... Do I test again? I'm like 2 weeks late now. Does it sometimes take that long to show up positive?