AF-like cramps? Freaking out!

Maggie • Age 29. Baby #1 on the way!
I got a faint positive today, but after a m/c in January, I'm trying not to get my hopes up until I get a few days if progressively darker positives. I'm feeling some really mild, AF-like cramps. No spotting. Is this normal? I'm so worried AF will rear her ugly head any moment. :-/