Am I pregnant

Al

Hey I need advice I am 17 and I have missed my period and done 4 pregnancy tests and got 2 negative 2 positives one positive is sting and the other is faint but I took one after them and got a negative but I think I don’t it wrong my boobs have also got bigger and I have gained a bit of belly weight i have also had a lot more symptoms but I’m confused about the 2 negative and 2 positive leave your comments and tell me what you think xx