1st period after miscarrage

Steph
I know everyone is different but what was your 1st period after miscarrage like? I lost baby with missed miscarriage at nearly 13 weeks but baby was 8w5. Its been 3 1/2 weeks and I haven't had much bleeding yet but have been cramping on and off for 3 days now and just having a little blood or brownish spotting when I wipe (sorry if tmi!). Is this normal? Do you think I could class this as start of period or maybe just run up to it? If i hadnt have been pregnant i would be due around now normally. Very confused as body is behaving very oddly at the mo! Normally period is pretty straightforward and regular with No cramping so not sure what's happening. What do you all think? Any one gone through the same thing?