how long do you bleed after a chemical

Leah

I got a positive pregnancy test on the 16th and the 17th and then negative on the 18th. i started to spot on the 17th and the bled heavy the 18th 19th and the 20th being today but its stopped. ive had no bleeding for a few hours. my period is usually 5-6 days long. ive never had a chemical and im really confused.