Period 4 days late but negative preg tests!

AshyB

TTC for 9 months now, saw a fertility specialist last month and my bloods and ultrasound are normal and hubby has good sperm count. This month my period is four days late but my pregnancy tests are negative. I'm devastated and don't know what is going on. I had one occasion at the start of the year where my period didnt come until day 42 of cycle! This time blood test actually caught me having an LH surge (thought sadly I didnt know until a week later) but we did have sex about 12 hours before my blood test. I hate this process of TTC. I'm especially sad because my best friend announced she was 14 weeks pregnant this week and they had only been trying for 2 months.