I think I'm pregnant, but spotting a second time...?

I spotted in Mid June, and last night (5th July) I noticed blood when I went to the bathroom. It started light, and now its a bit heavy. I've always had heavy periods, I didn't have a period last month with the exception of that spotting. All I did that was out of my normal routine was help move an entertainment center with my husband, though he did all the work. My back and sides have been sore, like someone punching them. I want so badly to be pregnant, but my husband refuses to let me buy a pregnancy test. Now you ask why don't I get one behind his back, well I can't drive, so I'm dependent on him to take me places. He refuses to take me to the doctors till the 20th, just to prove that I am or am not pregnant. I hate not knowing and no way to convince him to change his mind. I tried telling him that not knowing is killing me, but he doesn't seem to listen or care. He doesn't want me getting my hopes up, but I rather get a test that says 'no', than actually BE and not be as careful as I could have been.