because your periods are your cycle and the average may be based on a 28 day cycle but this all changes through out your life and your mother or aunt might have a 40 day cycle. so while it would be nice if u could say my cycle will be 22nd of each month; it is not going to happen except to a few and at some point that will change too.
well it would not actually be your period because that is cycle and pregnancy interupts it but many attempts fail and that is your body protecting u, a little spotting is sometimes evidence of implantation
if u r confirmed pregnant from your dr, then u would want to stay in contact about any bleeding
good luck and best wishes
Hello , Me And My Boyfriend Have Been Trying To Concieve For 1 Year Now But Still Haven't Had Any Luck. I Have Been Charting My Cylces And Tracking Down The Days I Ovulate . We Do The Baby Dance On The Day Im Fertile. My Period Is not Due For Another Six Days Why Am I Bleeding Today . Last Month I Was Suppose To Come On September 4 2013 And My Period Came 4 Days Later .