What chance of failing is pulling out?

I know it’s not 💯 but I don’t really see many stories of it failing.

My partner and I have been easing off on trying for a baby due to covid 19, but have just been pulling out. Had sex twice in fertile window, pulled out both times.

I’ve had a few weird symptoms, random cramps from CD26-29, big tender boobs, my nipples are very perky and longer - areola doesn’t look heaps different, very bloated and tired. Also occasional feelings of dizziness when standing and occasional nausea after a few coffees (that I drink all the time).

Waiting for period to arrive now (CD35), my cycle is usually around 31-33 days.

Surely not? 😳