Massallah pertaining to Haiz and Istihatha

Aslm…i bled on the 13th day after my last period…i know this was not considered haiz as the minimum tuhur period is 15 days…my questions are as follows:
1)if i bleed on the 13th day up to d 19th day will i consider the 16th 17th 18th and 19th as my haiz or just take from the 13th day up to the 19th as one bleeding and istihaza?
2)if i bled the 13th day only and than again started bleeding on the 18th day and this bleeding lasted for 4 days i.e up to the 21st day will i consider from the 18th day to the 21st as my haiz?
Jzk for your help