Could it be implantation bleeding?!?!

Charlotte
So this evening I went to the toilet and I had brown/pink discharge only on the tissue, I'm not sure when I ovulated because I haven't taken any opks this month, I'm not due on for another 10 days, and I had cramps in my left side yesterday which I never normally get? If it is how long should I wait before testing... trying not to get my hopes up😩