Wondering

So I'm 43 and TTC since March. Last month I had an unusually heavy period. This month I had spotting for two days a week before I was supposed to start. I've been slightly crampy, sore breasts, hungry alot (no particular cravings), and still no period. I've taken 3 tests, all negative but my fiance suggested that I may need a blood test since its so early and because of my age. anybody else been through something similar? I used the cheap 88¢ tests and its been suggested that I try a more expensive one. My OBGYN is closed today so I can't call them. Any advice ladies?