17 year old in desperate need!!

So back in August I seen a guy I kinda knew from school on the bus (I was with my ex at the time and the new lad has a girlfriend still now) he popped up to me as soon as I got off the bus and since then we have being seeing each other and I split up with my ex cause me and this new lad have fallen in love (well I know I definitely have) but now I’m nearly two weeks late on my period I’m never normally late and I’ve taken two tests and both negative but I have had some symptoms of pregnancy. What do I do? Help anyone please?