am I pregnant?

Okay so me and my boyfriend have sex obviously. I’m 18 and I don’t want a kid. I got my period December 11 but it was very weird. I was bleeding but not onto a pad the blood would only show up on toilet paper when I wipe which many people say is a lot like implantation bleeding. I took a good five tests which were all negative. He’s never came inside of me unless there was a broken condom we didn’t know about. But now my stomach very bloated and my breasts are a tiny bit bigger but I’ve lost weight. Doesn’t sound like I can be pregnant but it feels like it. What do you girls think?