Late period but BFN

Positive ovulation on day 28 and day 29 which is cycle day 18 and 19, making my 29 day cycle on the later end of ovulation.

Had some cramping start on the 2nd and is still going on now. Boobs are a little sore as well. My period was supposed to be here on the 10th. I usually cramp a week or so prior, spot on cycle day 29 and full flow on cycle day 30. Tested with a clear blue pregnancy tested on the 11th and it was a BFN.

If I ovulated late, wouldn’t that make me implant later and that’ll possibly mean I’ll get a BFP later than normal as well?

I’m not sure, just trying to make sense of why my period is going on 4 days late...