Were you actually pregnant but couldn’t get a positive at home urine test?

Losing my marbles a bit.. I average 12-14 days after ovulation until my period arrives. This month I’m on day 18 & no period. It was due 4 days ago & I’m not getting a positive pregnancy test. Has this happened to anyone before? We are TTC and I think this is strange.. trying not to obsess or get my hopes up.

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