positive preg test and im scared

hi ladies i just took a test and the 2 lines came up straight away but i dont think it will be a viable pregnancy as i have no idea how it happened as my last period was 8 weeks ago and i dont do opks and i was taking metformin for a few weeks and then i stopped i waited a week and no period so i took the pill for 3 days to bring on af so i could start clomid and metformin again but now wat do i do i have heard to keep taking metformin so do i take a tablet tonite until i can get into my doctors just to try and be safe im sooo freaking out right now its like its a miracle but i have a bad feeling it will end in sadness as i miscarried last year at 10 weeks please help me !!!!!