Could It Be Implamation Bleeding

So I had a normal period from 6/9 to 6/13. Few days later my husband and I had sex on 6/15, 6/16, 6/18, and 6/19. The next day I was having pelvic pain like my period was coming and I was like couldn't be I just got off of it so on 6/22 I went to the bathroom and wiped and on the tissue it was very pink blood, it did that all day off and on with small clots. The next day it went dark red but still spotting and one huge clot came out but I did not feel it, I just saw it in the toilet. I had no cramping for those two days. On 6/24 it stopped almost completely but then I start getting cramps in the top of my stomach. Then today on 6/25 I just only had a drop of blood and cramps again. What could it be please help. Has anyone else had this?