HELP opinions please AF was a now show ,test

so AF WAS due yesterday and she never came,still no sign of her. I took a test last night and got a bfn,and glow pushed my period back 3 days and changed my ovulation date to the 18th,instead of the 15th. luckily I bded the whole time but what are the chances I'm preggo and not just expecting a late period? the negative test is what is confusing me,is it just too early if I did ovulate later then the 15th? ughhh help lol

my new cycle according to flow,I thought I ovulated on the 15th originally but I'm either wrong or I'm preggo and getting negatives (which I doubt)