Just as a footnote to what Smurf has posted:
Have you checked out our helpful article Intercourse 101 yet?
It's full of advice on how to make intercourse work the first few times.
In regards to the birth control pill, aisde of the different pill types (combination pills and progestin only pills), there are lots of different formulations for each kind, and some work better for some than others.
In general, the reliability of the different combination pills, which most young women are on, is pretty similar, so there is no "higher dosage=higher protection" equation.
With typical use, the failure rate of the pill is 5%, that means within one year of use, 5 of 100 women using that method will get pregnant.
If your partner is using the pill consistently, isn't taking any herbal remedies that might interfere with it (like the St.John's Wort Smurf mentioned) and hasn't been suffering from bouts of diarrhea or vomiting, and you keep using the condoms, your pregnancy risk would be low. No method pf birth control is completely reliable, but the pill&condom combo is as good as it gets with reversible birth control.
"Through repetition the magic will be forced to rise."