Hi! My Boyfriend And I Are Going To Try Having

Hi! My boyfriend and I are going to try having sex for the first time. We are 20 and 22 years old and are both virgins so this is all very new to both of us. We are going to use condoms and the morning after (Plan B) pill but I am still really worried about the risk of becoming pregnant. Is there anything else I can do to prevent such an occurance? Any advice would be appreciated! Thank you.