Help!

So not sure if I’m pregnant or not and I’m hoping someone can help shed some light on what’s going on or maybe they’ve been through the same thing?? I tested faint positive 3 days before my period. Went to the doc and my hcg was only 2.5. He told me I probably had a chemical pregnancy but that I’m not pregnant. So I waited for my period to come but I’ve only had dark brown discharge for two days and now my period is 2 days late and no sign. I tested but have a faint positive again.....not sure what to do. I don’t believe it’s positive and probably an evap line?? Anyone gone through this and still been pregnant?? My boobs hurt but no cramps or other signs of period....help!