How early can you take a pregnancy kit test for pregnancy?

I managed to test positive 1 day right after I have missed my period for my first 2 pregnancies. I used clearblue digital pregnancy test kit to test. I really like this brand as it will tell me whether I am pregnant or not and current weeks of pregnancy. I used pregnancy strips before and it made me more confused as the line will not be cleared during initial days. For pregnancy no.3, I did not have mense and it was interesting enough I have intuition/five sense that I might be pregnant and it turned out positive. If you do not wish to do home test, you can visit any GP to do a blood test to check your HCG level to confirm pregnancy immediately too.