Also, we did use a condom and she is on the pill (because her periods are quite bad), but I did put my fingers into her also and I`m pretty sure there was absolutly no pre-sperm on them. How likely do you think the chances are that she may have become pregnant by that?
She says that there are varying degrees of how strong the pill is. Is this true? Are some pills stronger than others?

There are different pills w/ different effectiveness for each ... Is she on any other medications? Taking St Johns Wart? Things like these can decrease the effectiveness of the birth control pill, but since you're using condoms as well, like you should be, you really have nothing to worry about.

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.

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Caro
~Scarleteen Sexpert~