my lmp was 6th december so i was due af again 2nd january. i had sex 26th december and 1st january. the day af was due and the day after i had period pains but no blood. so far af is 5 days late.the thing is last month af was 3 days later than normal. i did a test today but BFN.could i have tested too early as i only had sex 12 days ago? any advice welcome. TIA