I was due to get my depo shot between Sept. 22nd and October 4th. I opted out. Since then my fiancŽ and I have been using condoms, and I haven't had my period yet. On Dec. 2nd we had unprotected sex then on Dec. 9th the condom broke. I have now started what I believe is to be my period on Dec. 13th and today is now the 18th. It has not been heavy though. I haven't had to use a pad or tampon. Is this normal? Could there be another reason for this?