Please help. Am I having implantation bleeding?

I had unprotected sex on my ovulation day and my partner finished inside of me many times. The app said that day was the highest risk of pregnancy day. It’s been 11 days since, and a few days ago I noticed my boobs were sore which I figured would be way too early for pregnancy symptoms so I didn’t care. My period is due in 4 days and I’ve noticed today that I’m spotting. It’s never happened before, the blood is kind of pinkish/brownish and it’s got some tiny very little lining/clots whatever you call pieces of skin. I’m waiting for my period day so I can take a pregnancy test but I just wanted to know from others experiences if this spotting sounds like a implantation bleeding? I know for a fact I’ve never had this kind of spotting right before my period, this is the first time. And this spotting thing been going on since yesterday but I didn’t care cause i could barely tell it was blood, then today when I wiped I saw brownish blood with very small clots only one or two. Then I wiped again and even put a tampon in just to be sure and saw the same pinkish/brownish blood with a few very tiny blood clots or uterus lining I honestly don’t know what to call those but they definitely looked like small pieces of skin. Its very little blood but it’s still there. Definitely enough amount to worry me. I’ve never been pregnant before. Any opinions based on your experiences will be appreciated.