How long should temp be high DPO?

Sarah
I miscarried on March 17, and was supposed to wait until I got my next period to start trying again. I have an irregular ovulatory system so we probably weren't as careful as we should have been. My chart looks really promising this month that I've actually ovulated. How many days post ovulation should my temp stay up? How many days do I have to wait to test? I want a baby so bad and have mixed feelings on what I would even want the test to say. I definitely don't want to miscarry again. Any insight would be much appreciated! Thanks