What is happening, has this happened to anyone?

I seriously feel pregnant. Crampy, slight spotting, kinda sick, no real appetite but when I get an appetite it's for everything and anything. And just generally bleh. I've taken two tests. One I thought had a faint line but I didn't look at it in time so I had to ignore it, and the other was negative. The last time I had intercourse was July 29th so I'd be at least 6 weeks if not more depending on all that technical stuff. It could just be hormones and maybe my period is trying to start (still breastfeeding my 7 month old, although mostly pumping and he is getting supplementation). But my question is: has anyone tested negative until a little later? Like should I bother testing again or is it safe to say I'm not since I had a negative test a few days ago? With my early loss and my son I got faint positives before my period was even late so I can't imagine I'd still be getting negative if I'm pregnant, but I have no idea.