Possible Implantation Bleeding?

I am 11 DPO. Last night, I experienced a sharp pain in my left pelvic area followed by little cramps. The sharp pain lasted a couple seconds. I woke up today and while I was driving, I experienced the same thing on and off. When I got home to use the bathroom, when I wiped myself, TMI I apologize, it was clear creamy CM with light pink. I just put on a tampon just in case. The pain still come and go. My cycle is irregular but my AF came last month on 8/16. I had a positive opk on 9/3-9/4. Do you think this may be Implantation Bleeding?