Strange cycles TTC

Al

I test with OPK and I was going to start using BBT but I forgot 😅 Anyways I had an ALLMMOSSSTT PEAK LH then it faded fast, today I took one for the fun of it on cycle day 18 and it’s POSITIVE, I always have a 28 day cycle and don’t usually ovulate till a week or so before. I also nurse and just went away from babe and didn’t pump for like 24 hours. I guess my question is, is it possible to conceive with ovulating 9-10 days ish before period, I didn’t check the night before so it could’ve been dark then too.