Period late

So me and my boyfriend have sex right, we don’t use condoms but he’s never came in me EVER He’s 19 I’m 18 I just graduated high school life’s are barley beginning we don’t live together and I just got a job. My period is late 2 days and I’m worried should I be worried or should I start freaking out later if I’ve missed a week if I am pregnant I am totally NOT ready, neither of us are and plus my parents would kill me and him and we were thinking about just terminating the pregnancy but I am so against that I don’t think I could bring my self to do it and he says he will stick by my side no matter what Moral of this paragraph is SHOULD I BE WORRIED NOW OR WORRIED LATER WHEN IM A WEEK LATE