Few questions

My husband is in the military and he just cme home from a year long deployment.. We tried for 3 months before he left but I couldn't get pregnant, but I didn't find this app till recently. We want to start a family really soon. My questions are what are we doing wrong that I can't get pregnant? While we are trying and he's finished and pulls out is it normal for a lot of fluid to come out? What can we do you higher out chances of conceiving? Please help!!