I can't get two of the same results in a row.

I have been testing almost every other day because I got one very faint positive and the next morning got a negative. Since then I have had every one read negative and another random negative. I know I am taking them right and reading them at the right time. This isn't supposed to happen! I don't know if I should feel excited at all or not get my hopes up. I want a baby so bad. I think I should get a blood test but don't want to make an appointment for it. Will they do it at the hospital or just a urine test?