I went to the hospital about 3 days ago

To try and see what’s going on with me because I was 12 days late. And they told me nothing seemed off everything looked normal. People keep saying stress but I’ve been the least stressed in February than the year of 2018 as a total.....I have no idea what’s going on and I’m 15 days late now. The doctor at the hospital told me if I don’t get a period in 2 weeks to test again for pregnancy. Now I’m stressed a little because I don’t know what’s going on and this isn’t normal.