Where is Aunt Flo

Me and my SO have been tcc for 6mths. I was due to start on the 7th I took a test on the 8th it was negative. So I waited expecting it to show up today is the 11th nothing yet. Last night we were having sex and things got a little rough I spotted a little only when I wiped. I took a pt this morning still negative and no Flo. Anybody had this happen. Or might know what is going on