Braxton Hicks pain?

Hey girls! We're in round 6 now. About 3 months ago, 5-7 days after sex, I had huge, sharp stabbing pains in my vagina during ovulation. I've never experienced pain like that before; I couldn't even stand up straight. It lasted all day, with the pain coming in waves every few seconds. In the evening, it got much more intense, and I even had to cry from the pain. Unfortunately, I got my period a few days later.

Now I've had this exact same thing again! It could also be about 5-6 days after conception. Is it ovulation? Or implantation? I usually feel almost nothing or just a small cramp on the left or right during ovulation, but I've never had anything like this before. I really hope that if it is implantation, it implants properly this time!

(I have irregular cycles, and ovulation tests don't match up with the mucus method.) So I follow my mucus and have sex every 2 days, and then a bit more after that.

My question to you all: who has ever felt this super severe pain?