so i took a pregnancy test yesterday and it came up with a very clear positive and i took another which was negative. i then took another pregnancy test which was digital clearblue but said i wasn't pregnant but my period has been late for over a week now and i felt quite ill all day. My mum says i should take another one that a bit more sensitive but i don't wanna waste all my money if Im not. Should i get another one in case I'am ??