Faint positives, negative blood work, Nexplanon, and confusion

My blood work came back negative and I'm confused. I didn't think to ask if my levels were zero, so I might have to call or go there again and ask for clarification. I've been having pregnancy symptoms for weeks and weeks, pretty much all of them. I'd chalk it up to Nexplanon messing with me since I got in in the end of May, but that doesn't explain the multiple faint positives I've gotten. I'm so confused. The blood work was supposed to give me answers, but I'm even more confused about what my body is doing. I was talking to someone else about it and she mentioned I could have a begnin (spelling?) tumor on my pituitary gland, so now my anxiety is worrying about that.