Implantation bleeding????

My period is due on the 11th. Around 4:00 in the morning I went to the bathroom and wiped and it was light pink blood on the tissue. I thought it would be my period so I put a tampon on. I woke up this morning and it’s not ANYTHING on the tampon. Has his ever happened to one of you guys & then you found out you were prego????. Please comment. Thanks 😘