So odd to read this question this morning (have never seen it mentioned before) because I was wondering the exact same thing last night as I couldn't stop scratching all over for no reasons.
Is it what is happening to you? I don't want to infer anything in my case as I have just come off the BCP, haven't even had a withdrawal period yet, and as I am 38, the chances that I'm pregnant are very low but..... can't help wondering as no signs at all of AF coming but for stomach pains that have been coming and going for over 10 days now.
Anyway, cross fingers this is a good sign for you. How long have you been trying?