Questions about losing our virginity?

okay, we are both 16 and shes almost 17. we have been through a lot and love each other very much. when i first met her she was very pro abstinence (only abstinence). she now has expressed she wants to have . I want to be absolutely safe but still enjoy it cuz its my first time. i want it to be memorable and enjoyable and worry-free. I plan on using a condom (only one cuz i heard two makes them more likely to break). I also want to use another contraceptive to be safe but im not positive what to use. the pill is a no go because its against catholicism apparently. i heard about spermicidal foam but im not positive about the effectiveness nor whether or not it might eat up the condom. what are my need-to-knows here about the first time and what should i know/do about contraceptives? also, should i do the pull and pray along with it just to be safe? anything either of us need to know in general? any help is great. thanks a lot.