Would my levels be back down by now?

I miscarried March 4th at 17 weeks, baby was 13 weeks. I didn't think to take a test to make sure my levels were down before we ttc again. Has it been long enough that my levels would have definitely gone back down? I've had 2 AF and the last one was completely normal, and I healed quickly and didn't have any complications from miscarriage. We ttc and I plan to test this Thursday, just wasn't sure if there was any chance of testing positive and it'd really just be leftover levels from miscarriage?