When we speak of pregnancy in most cases we always think of the mother and the changes start to happen in your life, but almost never in the parent. In fact very little is said of the parents during this stage of the life of your partner and truly a great majority do little to get involved in pregnancy, perhaps only read and learn about it, but not until it is already the baby starting role. But there are several things you can do at this stage.
An excellent idea is to be at most of the times you can with your partner, for example attending to her at least one prenatal appointments for care and try to ask some questions there. Nor miss the opportunity to see your baby during an ultrasound and if your partner has an amniocentesis or other procedure to know about genetic defects, try to be there too because a little support is valued.
A large proportion of women really like to see their partners a little more involved throughout the process and if they miss something are something that will remain in your memories and feelings to life. So try also to attend classes to prepare for the birth so you can be with her and help her when the time comes that your child is born.
A good way to show you care about your pregnancy and you like your body is to take a profile photo every month that passes for a record of how your body is changing. You should also try to understand that as time passes, your partner may feel unattractive, so still trying to show you like, but try not to do too sexual, because sometimes not in the mood for it.