My girlfriend stopped taking the pill without telling me

[PhallicGiraffe]

I just found out that my girlfriend of 14 months, after asking her, didnt renew her pills for birth control round about mid-November. We've had lots of sex since. When I asked her why, she 'wanted to see how I'd react'.
We've talked about kids, and we've both agreed we want them, but not right now. AIBU to want to run for the hills?
P.s. As a bloke, wanting a female perspective.

A year ago I was told off for being irresponsible by quite a few posters for getting pregnant despite having the injection and using condoms I had simply taken a guess that perhaps a condom broke or I had got carried away without on a couple of occasions.

They didn't even register than I had had the injection it had been done correctly no user error at all.