could i be pregnant?

my husband and i have been trying for our first baby, for about 4 months and have not been sucessfull yet :( the last period i got was last week but it was strange. i am normaly very regular and it was 5 days late. i normaly bleed for about 4 to 5 days and this one was very light only lasting 2 days. i stopped bleeding for 3 days then spotted on the 4th day. i have not taken a test yet but is this normal? could this mean i am pregnant? or is it just something i need to go get checked out?