Early period that is long and very light.

early long light period , am I pregnant?
I am usually a 31 day girl, always a very heavy bleeder from the first day. My husband and I are trying to conceive.

last month I started a week late on march 20th, it was a little lighter then usual and lasted the normal 4 days. Now in April I started on the 3rd or 4th. it was light I only needed pantie liner or nothing at all. it is still going on and it is now the 11th. the blood has been light red most the time .
I was wondering if this is a period or if it could be implantation bleeding.
also if it is implantation bleeding when can I take a test.