After confirmed ovulation what can delay my period? i'm 15dpo, took clomid (clomiphene) 3-7, on progesterone & estrogen until af/bfp. all tests neg. usual lp 12-13

That's a lot of: abbreviations, so I'm going on "educated guesses" and assumptions. After you took the clomid (clomiphene) and confirmed ovulation, were you on estrogen & progesterone until you started your period? I assume your Luteal Phase (LP) is 12-13 days (normal) but I'm not sure what the BFP means when you said all tests were negative. The estrogen & progesterone may have be the cause of the delayed period.