Is Light Period And Brown Bleeding Symptoms Of Implantation?

I had my period on the 17th through the 20th of this month (which was on time), but it was really light and mine always last 7 days and this one didn't. I started lightly, kind of brownish, bleeding on the 30th and today My husband and I are ttc, could it possibly be implantation bledding or what could it be?