Absolutely do not push the issue!!!! you will scare her and put her off...
The first time does hurt, and for some people a lot... in fact.. some girls even bleed. You need to assure her that you are going to be very gentle with her and if she says stop YOU WILL STOP!!!!!!!!!!!!!!
As far as being afraid of getting pregnant, that is a little odd because condoms are 99% effective.
Give her some time and let her know that you support her and you understand her fear..
I was once afraid too, except I had a background of sexual abuse as a young teen by an employer .... so i had a valid reason, but still.... i understand...
good luck, it will be just fine!
Hunter S. Thompson once said "Buy the ticket, Take the ride."