Confused

Sunday I tested got three maybe four faint positives(frer) went to a women’s center Monday to confirm.. negative they said but still early so come back next week yesterday I used a different brand which came out negative this morning I tested again and it was even more faint than Sunday...

What does this mean could it be a chemical pregnancy am I still pregnant are my level just not elevating as much as they should

What should I do

I do have an appointment this upcoming Monday at the same place (not with an OB)