I think that it's wonderful that you have a mother with whom you can have open and honest discussions with, especially concerning sexual relations. There is really no need to explain whether you and your partner have considered marriage. As long as you both are consenting adults, how, when, why, and what are really none of our business. WH is a forum where you can be open and honest, ask for knowledge and help, without judgement or prejudice.
I understand where you are coming from on not being so forthcoming with your father. Being lectured, preached at, or belittled is not going to help you. Furthermore, this a personal decision.
You may find it helpful to take you BC with food, rather than on an empty stomach. Your body has to adjust to the hormones, hence the nausea, but it should subside. If not, there are many BC pills on the market. It may take trying a few to figure out one that works for you without the unwanted side effects. There are a few people who absolutely can not tolerate hormonal BC, and they chart their basal temperature and use condoms. You can search through some of the threads and get more information on this if necessary.
Best Wishes
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