Lower Placenta

Hi, I was 39 when I learned that we are pregnant with our 1st bb now I'm 16 weeks and I got covid 6 Mar fever and body ache subside after 3 days buy my cough is terrible and bcoz of that I have blood clot my hubby called my OB and he asked to take a bed rest so I did but in that night we decide to go kkh bcoz of anxiety don't know what is happening. So we went to kkh and bb is ok but I still don't understand the cause of my blood clot. Anyone experience the same and you OB advise?