Missed period

I am now on cycle day 54. That's 27 DPO. HPT and blood test are neg. So I guess I'm not pregnant, but why does my body have to be so unpredictable? Ovia has started just putting "?" for the next period dates etc. Pretty sure Glow will hit the limit (I know there's not one but dang!) on how many times you can hit the "my periods late" button. If AF is coming, I'd just prefer she come on! Every day we have to wait delays the process of waiting for fertile days, waiting 2 more weeks and so on like every month for the last year. Very frustrating. Especially after getting the BFP in December and then miscarrying. I never thought it would be so difficult to conceive, but here we are at 34 & 35 trying again. We've got a 13 year old and 9 year old from previous marriages, but haven't been able to together. Ok sorry, rant over. But it's been a very long confusing 2 months...well year really.