Im scared that I’m pregnant but don’t want to ruin my chances at my planned out life

I (17f) am scared that I may be pregnant. For context my boyfriend (18m) is in basic training right now and will graduate in 10 weeks. I am looking for a job, going in Tommorow morning to get a job at a fast food place. My family is complicated in so many ways, but when I was 14 I worked for two years at a small restaurant and had saved over 3.5 k. That is a small sum of money, but it would have helped if it wasn’t stolen from me by my caretaker. My caretaker who I call my grandmother (not related, but my siblings are and I was grouped in with them and taken in anyways) has raised us for most of our lives after our mother gave us up to her after cps finally removed us and my grandmother took us in. I’m grateful for that but she has had a habit of stealing from the family to make ends meet. My other siblings had moved out so it’s only three of us in the house now (me, caretaker, and my sibling). We still struggle financially which also worries me, because I could not afford to raise a child in a two bedroom house, especially since my bedroom is the size of a walk-in closet. My boyfriend, who is the kindest person I’ve ever met, is away so I feel so alone in this. I cant confide in anybody about this, friends or family, since they all spread things like wildfire. I’m terrified of being so alone. I have no money and no car, no way to even get a test. And even if I would take a test and it come back positive, I have no plan to be able to raise the baby. I am very pro choice, and i know what my choice would be, I would have to keep the child. I am infatuated with motherhood, I absolutely love the idea of giving my everything to my baby and raising them to become a strong person with a strong support group, which is what I wanted so deeply growing up. My boyfriend is absolutely my soul mate, and I may be young and naive but he truly is my person. He comes from a kind loving family (I’m going to see them Tomorrow since I still love them and will continue to see them while he’s gone) and they have welcomed me Into their family. Despite all the cultural differences, they have worked hard to include me in everything they do and even try their best to teach me their first language (doing my best to learn since some members cannot speak English). I don’t want them to think less of me or think I’m pulling their son down while he tries to start his life. I’m so ashamed. I don’t want to be seen as a teenager who couldn’t keep her legs closed. We always did it protected, but right before he left the protection broke. I am in birth control, but i had accidentally skipped a day because I had went to bed without taking it because I was exhausted. I am now 16 days late, which is the longest I’ve missed even though I have accidentally skipped it a few times (we were not sexually active at the time) and it was normal. I had did the pregnancy math of if I was pregnant how far along would I be, and it came out to five weeks. I’m a fairly skinny girl, but I have noticed bloating like crazy, I haven’t stopped eating, and last night I cried over craving fried dumplings and not being able to eat them. I had also thrown up in the morning a few times and feel so weak and sickly. And other tmi details about bodily functions that don’t point to good signs. I love my boyfriend, and we had wanted kids in the future after we settled down and could afford it. I don’t know what to do, I’m hoping it’s not what it seems and that I’ll get a negative and my period, but what do I do if I get the positive? I don’t want to ruin my life plans, it’s my last year of high school, and my bfs first year of the military. What do I do?