It's kind of hard to say for sure when you Oed b/c you have so few temps... Abd going by OPK's and CM alone to pin down O are just not enough to know what is going on all the time

So, I don't feel comfortable guessing how long your LP is "if" AF shows.. It's even hard to say by your last couple temp dips if AF will show.. I like to have a few solid pre O temps to even take a crack at predicting something like that.
But, you are right.. A short LP can make TTC very tricky.. Although I'm not sure if a really short LP or really long LP make conception completely impossible. But, the closer to 14 days, the better.
Sorry I wasn't a whole lot of help