Not every woman has a temp increase on her fertile days. That is why the calander method of birth control does not work. If you are trying to get pregnant, does your boyfriend know that? If not you can plan on this ending badly. Maybe getting married first might be a good idea. If he is opposed to marriage you might ask yourself why? Being pregnant, or having a baby, is going to make getting through nursing school more difficult. I is already pretty brutal, the drop out rate is over 50% in most places.