Came off the pill 8 weeks ago. Been on it years and wanted to get back to normal cycles, DP and I planning on TTC in summer/autumn time.
We've been using condoms and I'm using natural cycles app to track temperatures and really to work out my cycle, I've been on the pill that long I don't know my cycle lengths or anything. I've been on the pill since I was a teenager and quite honestly, I don't even know much about ovulation and how it works. I'm trying to learn!
So:
Withdrawal bleed - 6th til 10th Jan
1st period - 6th, 7th, 8th, 9th February
Positive LH test 19th Feb morning, quite sharp ovulation pain 19th PM and morning of 20th
Now, on 17th Feb late evening we DTD and, after both having a really stressful day in work and a few drinks, got wrapped up in the passion and didn't use any protection. No lecture needed, we are idiots 
So basically, 48 hours before I think my egg was released, we DTD using no protection, just the once.
How likely is it I could actually be pregnant?
DP would be absolutely overjoyed so it's not like it would be the end of the world, I just wanted another 6 months or so first.