Possible chemical

So was pretty convinced I was having a chemical pregnancy yesterday. Received a positive pregnancy test, very faint, on Friday. Yesterday (Sunday) my lines were faint and I experienced bleeding and cramping and assumed it was another chemical. I happened to take another test this afternoon because I had one just laying around left over and it’s the strongest one I’ve had yet. But I’m still bleeding (not too heavy) and lightly cramping. Has this ever happened to anyone? Should I get blood work done? I’m very confused as I was not expecting any type of line today.