No BFP yet..

Bridget • 39 yo. DD born Sep 1 2017 after 5 years. iVF. Planning to use Frozen embryo early next year for #2..
So I'm 15 DPO and have had mild cramps every morning for a week or more but still no AF. This was my 4th round of clomid and this cycle they added utrogestan pessaries. I had flu around ovulation, wondering if this is why AF has not come yet?? Have taken two hpt's.. Both BFN's.. Sick of waiting, just want to know either way!!