Period after failed FET?

I just had my first failed FET. My period started today (3 days after negative test and stopping meds) It came quicker than I expected (which I am glad so we can roll into another cycle.) I've read a bit that a period after a failed transfer can be heavier - anyone have experience with a NATURAL frozen transfer? Most things I'm reading are experience after medicated cycles - and they are scaring me as the cramps today are much worse than what I am used to! I'm very glad this started over the weekend!