Overthinking

Hello 👋 I been feeling tried and I have summer vacation ☀️ so I sleep until I wake up and no problem with sleep. And when I sit with my boyfriend in the car I feel nausea just a little trip. Not sure if it because he is driving a little bit fast or what but, I never felt like that before? 🤔 I will take a pregnancy test when Im going home tomorrow cuz I'm sleepover at my boyfriend. Are I over thinking or 🤔? Not worry at all 😂 if I get pregnant then I am pregnant 🤰 I started to think of it on Tuesday when I told him I got car sick and he just joking with "Maybe you are pregnant 🤷‍♀️?" so I can't stop thinking of it now when I haven't taken the test 😂 😒 but I will take the test when I get home 🏡 but, is it a sign of pregnancy or just over thinking? 🤔 EDIT: I take birth control btw