Possibly implantation? New to this.

First time doing this and idk what to think. I know I didn't BD much on my fertile week. But I woke up this morning with light watery spotting and then again earlier when I was out with my SO. I have never had this happen before. I have a four year old from a previous relationship and never had any pregnancy symptoms. AF isn't due til sometime this week since I have irregular periods. I had a sharp pinch on my left side this morning for maybe 5 seconds and then it went away. Any answers or advice? Possibly pregnant? Don't wanna test yet. Wanna see if AF shows up. Thanks!