Whats the earliest youve gotten a positive pregnancy test?

My period ended two weeks and two days ago. This would be baby #2. I am super paranoid about getting pregnant because I am so not ready for another baby. My friend just found out that she is pregnant and that makes me even more paranoid. I have an appointment on Friday to get back on birth control but I'm sitting here thinking how tired ive been and how irritable ive been lately. Could be a lack of sleep but I just want to take a test to rule out pregnancy. I typically get my period like clockwork on the 2nd or 3rd of every month, so its a normal 30 day cycle.