Where is Aunt Flow? So confused...?

I've been ttc for almost 2 years - finally figured out opk's - hubby and I bd'd like crazy for 3 days after positive opk - was sure this was the month! AF was due yesterday - no show - took hpt - bfn! Temp dropped this morning to 98 but still no period. I'm usually like clockwork - never late not even a day! I'm so frusterated - did i test too early or what? I thought I saw traces of her (just a little pink on tp this morning) but since nothing - I'll wait till' the end of the week to test again if she doesn't show. - just venting and looking for positive thoughts.... feel free to induldge me (please)?!?!