10 days late and 2 BFN :(

I need some advice.... I came off the pill back in August last year, my periods have been pretty regular ranging from 30-35 day cycles. I'm now on day 45 and 10 days late! I had cramps the day before I was due so I assumed my period would start however 2 days past and I had a negative clear blue test... I waited a couple more days and took a first response test and that was again negative. I've not had any cramps since the day before I was due and I did ovulation tests which showed I ovulated so I'm so confused as to what is going on?! I just want to know if anyone else has had the same problem and what did they do? I had 2 miscarriages about 7 ago, I broke up with my bf at that time and I'm now married and we're trying for our first child but I'm petrified to find out if there is something wrong with me :( I had scans and tests when I last miscarried and all seemed to be ok? :(