Am I pregnant? Please help.

I live at my boyfriends house and his parents really don't want us having a child they didn't even want me living there. But I am homeless its embarrassing to say. I've been in 3 different homes in a few months so I don't know if I can do this. But I love baby's so much and having someone to be my family and not back stabbing me is my dream, enough rambling sorry. Here are my symptoms. No period in over a month. Almost two. And my last period was barely a period and my boobs got bigger and my nipples are different (can't explain, just different) I noticed a big weight gain. BUT it could be my depression and anxiety causing me not to leave the house and eat all the time. But now I only eat about once a day because I'm really depressed about my weight gain. I have stretch marks on my boobs stomach and sides like at the love Handel part. And thighs. I have constant nausea but don't puke. My stomach has a constant dull pain. And I'm so moody me and boyfriend got in a fight over passing potatoes. No joke. My boobs feel so much squishier and here's where it confuses me. I took 4 test. 3 different. Brands all negative. Please help. I can't go to a doctor because I don't want his parents to know. I'm still in high school last year and I'm in mechanics. A lot of heavy lifting and chemicals. I went off my anti depressants and anxiety pills because I'm scared that I am.