3 days in a row positive ovulation test

Hey guys, I posted a post yesterday about an ovulation test and I just wanted to post another one! For the last three mornings I have had three positive ovulation tests! So obviously I'm ovulating... I know that! But I have two part question: 1. What is my timeframe of being able to conceive because I heard that you're at your peak only one day out of the month for ovulation and you have 24 to 36 hours from that day... so which day do I go off of? 2. I heard if you ovulate three or more days in the month that means that your second ovulation time in this period of ovulation cycle And you could have twins!! Has anyone ever heard that?! 
Top pic was of this morning. Second was yesterday morning. I don't have a pic of the first one but the first test the two lines were equal and shade!