Feeling discouraged

Heather
Had a 6 day late AF last month (longest I've ever been late) got my hopes up and had my heart broken on day 7. This month I'm on day    10 and no sign of AF but 3 bfn's. im not sure what im doing anymore I've tried tracking and giving up the only thing I haven't done is oPk's I have an apt for a blood test tmrw because I have to know by wed if it's safe for me to go to six flags for work guess I'm just looking for some words of encouragement and to know I'm not alone out there