Could i be pregnant

I have pcos and this would be baby #1 but i need advice. I just went to the doctor about 5-6 weeks ago and got a blood test that was negative. I hadn't had a period in like 2 months. Right after that I had a period, and now I missed another one but now I can't eat. I've completely lost my appetite aside from water, ice, lemony things, and pickle juice. I dont want to waste more money on another test if its gonna come back negative. Should I get one or not? Does anyone know what else could be wrong with me?