Implantation? What does it feel like?

Virginia • Hi all! I`m 22 years old and have a beautiful little girl. I`m TTC baby #2!!!
So my period is due in 4 days. I've had 5 positive pregnancy tests and all of a sudden I keep getting weird sharp pains. Could this be implantation? I normally don't get cramps as an AF symptom so I'm not sure what this is...