4 & 5 week positives with fmu please!!

I’m a little concerned that I might be experiencing a chemical pregnancy or about to have a mc. I tested yesterday evening and got a faint positive and then again this morning with fmu and it’s still pretty light. According to my period I would be around 5 weeks now so I’d assume I should be getting lines as dark as the control or darker. I already have a little girl and when I found out I was pregnant with her I had a dark positive by 4 weeks. I am using the purple and white 88¢ Walmart tests. Please post a pic of what your tests with fmu at 4 and 5 weeks looked like. Thanks!