Could i be pregnant, please help?

i took a test about a week ago and to begin with it looked negative, but we found it two days ago and we could see a very faint line. so i took another one today and that also came up very faint (you have to actually squint to see it) before these two test no others came up with any lines at all, i also have been having signs of pregnancy for example going to toilet more, feeling tired a lot, being unusually emotional, spotting etc etc, could i be pregnant or are these lines evaporation lines? HELP