Pregnancy symptoms? So confused?

I think im possibly pregnant, im 3 days late for my period. Yesterday i spotted once ( a small drop) and im having on and off cramps and lower back pain. Im noticing discharge ranging from thick/pasty and white to watery and white. Im wondering if this is a yeast infection but im not experiencing burning or any real itching (it itches by my hairs because i shaved and its growing back but nothing chronic or painful) I believe i had a yeast infection a few months back and treated it. Also ive been really bloated, gassy, and tired and cravings. today i took a really cheap test and it came back negative i think. The line was so light though. I feel like my period is coming but nothing is there. Im stressing out now and don't know what to make of it. I have no insurance and i have to wait 2 weeks just to see a state gyn for a low fee. I think this is going to drive me nuts!!