I know this sounds somewhat strange, but I am so afraid that I am pregnant again!

I didn't O until CD 23, and my cycle is never any longer when I O late. Just like last cycle I am cramping and really nauseous now (at 5 dpo). I didn't really want to try this cycle, just wanted to wait to see the RE next week, but DH wanted to try so I compromised and said we wouldn't try but wouldn't prevent. He even more sneaky than we can be at times though, and managed to get me to BD every day CD 21 - 24 so I'm sure we covered O!
I'm so sure that if we did catch the egg again this month it's just going to end up in another m/c because of my short LP and low progesterone levels.
After TTC for 2 1/2 years it sounds so strange to ask this, but please send me AF vibes and pray that this isn't a BFP unless it's going to hold on long enough to get progesterone from the RE on Monday and be a sticky bean. I can't go through another m/c. Especially not this soon.