spotting week before period, negative pregnancy test

So this all started about a month ago (June 13th). Went to the hospital with what I thought was symptoms for a Brown Recluse spider bite. Nausea, vomiting, slight fever, dizziness, felt bloated, tired more then usual, constipation, and frequent urination. They told me it was nothing and sent me home. The next night I had a migraine from hell. Vomiting, cold sweats, felt like i was going to black out. So the following day I went to my Dr.'s. I explained all the symptoms including that I hadn't been able to keep any food or liquid down since the migraine. She proceeded to tell me she wanted blood test including a pregnancy test and a ultra sound. Go back 4 days later and she tells me the results, not pregnant and I have gallstones. So she sets up for me to talk to a surgeon. So this week I met with the surgeon, he says some of the symptoms sound like gallstones yet other sound like pregnancy. Maybe I'm just upset she said it wasn't but for some odd reason I can't drop the feeling that I'm not pregnant.

So then two days ago July 6th, I start spotting (a week before my period is due). But it's not heavy, not even heavy enough for a liner. I only notice it when i wipe after peeing. But the blood is like a brown/pinkish (not like fresh blood). After reading up and reevaluating my symptoms it sounds alot like implantation spotting. Even now I feel bloated (fat), I've been sleeping alot more (normally go to bed around 11pm now i fall asleep around 6 and im out all night), nauseous, vomiting, back aches, gassy, moody, crampy.

Anyhow tonight I took a Pregnancy test (1st response) and you  guessed it. Negative. I'm so confused.



What are your thoughts?