To Be or Not To Be-That is the question...HELP!

Hello! First-time post and first time TTC! I am 26 yo and anxious to start a family with my DH. I am on cycle day 30, expecting to NOT get my period today(which is due today). I took a test this AM, since I woke up at 4:20am with a sudden urge to pee. The test was a BFN...I was disappointed but went back to bed. I am just praying that I don't get AF today or any other day for the next 9 months! :D As far as symptoms go, I have been going to bed earlier this week and had heartburn all afternoon/evening yesterday(CD 29)...which is rare for me because I don't believe I've ever had it bad enough to actually look up the symptoms...but yesterday was a pretty bad episode. The past couple of months, I've been spotting 1-2 days before I get the regular occurence of AF...this month, I am supposed to get my period today, but have not had any spotting at all. If I don't get a normal period, when should I re-test? And is it best to test first thing in the early morning, as people say?? I have a well woman exam scheduled for August, since there was nothing sooner at my OB/GYN office...