It's a tough decision, I know!! With each of the months we tried to conceive/ got pregnant I remember having moments of confusion over how exactly to time our attempt, if we needed to add another attempt, if I was going to O in time for our attempt to be good, etc. The "one attempt" aspect of girl swaying I find really hard!! I will say though that this last pregnancy, we ended up with only 1 attempt (we BD-d at +OPK only) and I was really excited about that after getting my BFP (and I have a strong "gut" feeling that baby was a girl). Like Pbn said if you do end up with multiple attempts you need to make sure you'll feel comfortable with that if you do get your BFP and not second guess it too much. Ugh - I don't know it is so hard though to know what to do, I totally get it!! But either way - you still definitely have a great girl sway going on already.
Yea maybe just flip a coin when it comes time, or just try really hard to figure out what your gut is telling you to do and then do that :) :)