My boyfriend and I had unprotected sex the 30th and the 31st. When i went to my ovulation app it showed that both those days I was fertile. We came to the conclusion that even though he is 27 and I'm 20, that having a baby wouldn't be the best decision right now. So on the 1st I took plan B. Since i took plan b , is it a for sure thing that i wont become pregnant?