Hi Doc, I Last Had Intercouse 3 Weeks Ago. Today

Hi doc, i last had intercouse 3 weeks ago. Today I did blood test for my skin that goes along with testing my hcg levels. I got a call from a Dr to say I must stop taking my medication for skin as the test results from my blood test showed that I'm weak positive pregnant. I missed my periods for the past two months, I performed home preg test which came out negativeduring the time i missed my periods for 2 months. Furthermore I am on Minerva contraceptives