Girl Friend won't take Plan-B

I have been with my girlfriend for 8 years. During this time we have used condoms as our method of contraception, with the exception of 2 years when she was on the pill (Americans call this birth control tablets.) She stopped taking the pill because she had concern with putting a chemical into her body(her words), no medical reasons, in fact the doctor advised against it, just her objection to the ideology of taking a tablet every day.

So for the last 3 years we have been back using condoms. The complication is that condoms are not reliable, they split, they break, they come off etc. So, the deal we made is that we would go back to using condoms, WITH the understanding that she would also need to take the emergency contraception pill (Americans call this plan-B) if something went wrong. Everything was fine until this weekend when the condom split. I noticed before I came, but she has decided not to take the emergency contraception pill, because it makes her feel ill. Her decision came after her putting off talking about the subject for a whole day and after I said she should take it. I can't force her to do anything, but I am pissed off that she is breaking our deal.

I don't really have any questions, just a general invitation for comments if you think this situation is fare/unfair? Am I being too strict wanting her to take the emergency contraception pill?any advice?
Girl Friend won't take Plan-B
Add Opinion