Implantation bleeding?

Hi I'm 11 dpo and Ive been cramping a lil today and I started spotting. Its a mix between a dark brown and a really light pink, which was wierd... I think, so I'm wondering if it could possibly be implantation? I have been cramping today, and last night my back and side had a sharp pain that lasted for a minute... I honestly just assumed gas lol! Any opinions on if this may be my bfp? Been ttc for about a year and I have been tracking everything and everything usually lines up with this app, except this time I'm not suppose to start for another 4 days! Should I test yet? Or wait and see what it does.