HELP and question

Nina • A mom, wife, servant of God, praying for another miracle 💕
What's a cycle buddy? 
Also I'm 4 days LATE on my period and I'm never late unless I'm pregnant and since November have had two pregancies and two losses my last misscariage was on Easter and then I got my period on time in April and May and now I'm late and home pregnancy tests all have come out negative (all because psychotically I have taken test daily! Multiple times of the day) lol On my other pregancies I had postitives 9 days DPO. My question is has anyone found out 16/17/18/19 days past ovulation even after negative tests that they are pregnant? 😐