Pregnant after MC but before first AF? Anyone else?

Samantha
So I had a d&c at 14 weeks on August 11th. I wanted to wait until at least 1 cycle to start trying but started feeling pregnant again last week. I got a faint positive on wed sept. 9th when AF was due and tested again today sept 11th and it's darker but still light. I just went in for a beta and will have results monday, which means I get the weekend to worry. I have some symptoms but not all so I am worried it will turn out to be a chemical because I didn't wait. It's true what they say about it only taking 1 time. This is my 4th pregnancy with no children. Just wondering if anyone has ever had another pregnancy after a miscarriage before they got their first AF.