What is going on???

I usually have irregular cycles. But Glow is usually always right. I found out I was pregnant in April, which turned out to be ectopic. 😭 found out 2 days after my missed period! And I am currently 12 days late!! Last month we decided to try again & even used preseed. The last time I tested was Oct. 7th & it was negative! Has this happened to anyone& turned out to be pregnant?