I’m loosing my sanity!!!

Okay so last week I found out I was pregnant at 3w2d veryyyy faint. All tests continued to darken. Wednesday evening I started spotting- blew it off cause spotting is normal in early pregnancy. Yesterday morning i woke up and i was spotting more so I got worried and felt something was wrong. Went to er- my beta came back as at a 3- my tests THIRTY mins before were veryyyyy noticeable faints and I did notice they were a SMIDGE lighter then the morning befores. I ran out of first response didn’t want to spend more money then I already had testing so much so I bought the dollar tree brand. Came home and every two hours after I tested and they were all still faint positives. Tested this morning and it was nearly gone... tested when I got home this evening and darker then this mornings!? I don’t get it. I’ve been cramping and continuing to spot brown, but if my beta was at a THREE how the hell am I still pissing positive tests??!