Pregnancy test?

Let me start with a background story my husband and I have been trying for a while now to get pregnant and so far no luck and I thought it was me because my parents had a really hard time as well because my dad was told he couldn’t have kids and so was my mom. So now today I woke up to the feeling I need to take a test I went into the closet and pulled out the new box of pregnancy test and the first one I took cane out positive right way I thought it was wrong so I took two other ones and those came out positive as well. My question is are pregnancy test really accurate? Would it have messed up by me keeping it in a warm place? Am I really pregnant?