Chemical Pregnancy Help!

For those of you ladies who had chemical pregnancies when did you actually started bleeding? Was it the week your period was due, the week after, or did it take a couple weeks? I mean how long did it take before you lost the baby? Is it not considered chemical after the week of your period? Is it then just considered a regular miscarriage? I'm sorry I'm new to this whole chemical thing. Was praying for a sticky baby, all my positives are now bonafide negatives. I go to the doctor tomorrow for bodywork.