Haven't had my cervical cancer jab, what should i do?!?

Last year i was supposed to have a cervical cancer jab through school, but was declined when i suggested that there was a chance i could be pregnant (turned out i wasn't). I'm now 16 and have only just remembered that i never had it as my sister asked me about it, but my mum is still unaware that i haven't had the jab. Haven't a clue what to do as I've just denied not having it subconsciously to my mum. Where can i get it done without my parents permission?