Implatation Bleeding, Or early Period?

Siv

Hi Guys! A little background, I had a mc around early december, havent got my period back since then. And last the few days, I’ve been having sort of like period cramps, and my lower abdominal area just feel heavy. I thought my period were gonna come, but I still havent got them until today. My chest areas are getting a bit sore and tender too today. Then me and my husband had sex, he ejaculated inside me, then when I wipe, I see something pinkish sth (from the photo it looks brown, outside it is more pink) mix with his semen. Please somebody tell me what that is?! Do I need to go see my OB? I’ve never had this before. Thanks