Three methods at once?

So my ldr boyfriend is visiting in a month...we have been dating for 1 1/2 years. Since I will be 18 in July, I’d really like to have sex with him but at the same time I am scared of pregnancy in a paranoid way. We can only meet once a year, so we don’t have the choice to have sex regularly. Plus until my birthday, I would still need my mom’s permission where I live to get BC pills and she can’t know about this. She has made clear that as long as I live with her, she doesn’t want me having sex. Therefore it is difficult for me to take the pill.

My question is, are condoms + withdrawal + calendar method combined effective ways of birth control? This may sound really paranoid but even the slightest chance makes me worried. What should I do?

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