Update: I'm 99% sure my period came on Saturday. Same symptoms I normally get and its right when I would normally get it. I guess every body is different. Will have my hcg checked again in two weeks but I'm so excited to start trying again!

So I stopped spotting from my miscarriage about 12 days ago and now today I am experiencing spotting again. My last hcg test was on Monday and it was down to 33. Everything I read says you must have 20 days of no bleeding for it to be a period. Is this 100% true? I normally spot 2-3 days before my period and this Saturday or Sunday would put me right on my regular 28-29 day cycle. With my hcg so low I doubt there's any retained tissue, I haven't seen any clots. Just wondering what you ladies think.