I have heard of women on the patch trhowing blood clots and having strokes.....You need to read every thing you can about it.

if you don't trust the patch, you should use something you do trust. Perhaps the patch and condoms.

You can get pregnant being sterilized with a tubal ligation, nothing is 100% that's why there is abortion, and adoption..Because you do have options other than pregnancy.

The patch is around 99% effective (when used correctly) but, as carifairy said, nothing is 100% effective at preventing pregnancy and ther is always a chance.
It works in exactly the same way as the pill (releasing estrogen and progestogen into the blood stream except it's through the skin and then stopping ovulation, thickening cervical mucas and thinning the lining of the womb).
I've never used the patch (i cannot use birth conrtol with estrogen) but I have gotten pregnant whilst using the mini-pill perfectly so it's always possible.
If you're not comfortable with the patch have you thought about non user reliable methods (implant/injection/ius/iud)? Whilst there's still a small chance of pregnancy on these they do not require you to do anything and are the most reliable forms.

I know of at least 15 peeps that use the patch and none of them have gotten preg, but me on the other hand has.

So there are the results it is prob not that much chance