Implantation cramping and please.

My cycle has been very irregular so I usually use OPKs to help predict ovulation but with the craziness of the holidays I didn’t use them.

On the 1st I had all the signs of ovulation, heavy ewcm and ovary pinching, and sex drive was through the roof. On the 6th I had cramps all day like AF was about to show but she never did. Now I am hoping the cramps were possibly implantation.

All that said, how long after implantation cramping does it take to get a BFP? I tested today and BFN.