19 and ttc

Kimberley
I'm 19 and my boyfriends 24 we're both ttc my period is 3 days late I took a pregnancy test but it was negative... Should I wait and take another one? I'm also cramping but no period. Everyone keeps asking if I'm pregnant and my boyfriend keeps saying I might be but I don't wanna get my hopes up I'm really ttc and he said that he'll be happy if I was too. My boobs hurt and I've been peeing a lot help??