Implantation Bleeding?

Now that I'm asking this it seems kind of dumb....but my husband and I had sex last night and when I woke up this morning I was bleeding pretty heavily. I have continued having brown bloody discharge all day today...sometimes light, sometimes heavy. I just ended my period but it was pretty light and a lot better than it normally is ( very little pain) Anyways, before this bleeding I was completely off my period for 2 days....any thoughts?? Thanks everyone. :-)