Symptoms of pregnancy with PCOS

I feel like I have gained weight and have been eating more than usual however I don't think I'm pregnant but again I am not sure. I have not been nauseous or anything werid that a "normal" pregnant might consist of. My lower back has been hurting but I just had my cycle and it was just kind of spotting not like usual and having some lower abdominal pain on my left side here and there. Has anyone else had this happen and if so what do you recommend?? I'm scared to take a test because I really dislike seeing it be negative.