Being caught... Good or bad?

So I'm 16 and had sex at 15 however only used condoms. I realised it was a mistake and wasn't happy so I haven't had sex since and still not exactly planning to but if it happens I know I won't regret it if that makes sense. 
Anyway my mum always said to tell her so I can get put on birth control but I was too much of a wimp. 
Tonight tho we got caught being all heated in my hot tub which I know is going to lead to 'are you having Sex' questions. 
So from this my question is, do you think I should take the opportunity and just say we are thinking about it and act like we A haven't before, just so I can get the birth control or is that super immature?