When do you start counting the days as DPO?

Chelsea
Do you start with the first day of your fertile window or the last? According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> my fw was the 9th-15th, and Glow shows it to be 8th-14th. We had sex on the 9th, 11th, 12th & 13th. I'm having pain on the right side of my pelvis and I think I might have had implantation bleeding last night but I am not sure when my "days past ovulation" start! Please help ladies! My husband and I have been trying for a year and a half, we desperately want to be pregnant! This possible implantation bleeding was on the 19th. 
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You can have implantation bleeding as early as 3 DPO. This does look like it to me because of the color. Implantation bleeding is usually a light bright pink. Sending baby dust! ✨