5 DPO and Spotting Cycle day 30

Hi,

I am on cycle day 30 and 5 DPO. I use clear blue advanced ovulation predictor and has shown me peak after 15 high days which comes to 5 DPO. I experienced a slight watery drops of blood in urine. Unable to figure out if it is pink or red in color. I haven’t tested yet as I thought it will be too early for a BFP. I have very slight sore boobs and high constipation. Is it possible to have implantation bleeding that early ? Or its just my period assuming that my opk predictor was fault? Please let me know if anyone experienced this ?