advice?

My period was due on 10/5, my cycle is very regular. I have gotten a few faint positives, and I don't know if it's me over reacting but it looks like the lines have gotten lighter. And today I took a another one with fmu and it was negative, but iknow some said they can't get a positive unless it mid afternoon. I haven't had any bleeding or anything, just white discharge. I have an informational prenatal appointment on Wednesday, but I'm afraid they'll tell me I'm not pregnant when I go but since I'm 16 days late and have gotten 5 faint positives. I'm a little crampy and it seems like my stomach is a little tender when pressure is applied. Am I over thinking stuff and stressing myself out or should I be worried?