19 hcg

Ju
Hi glo community! So i dont wanna sound too ditsy, but this is my first pregnancy and i just got confirmed by blood last friday. I got my paperwork back today and it says my hcg level was 19, my doctor says im two weeks. But someone told me if they say two weeks then im four weeks? This is all jist sooo confusing to me. Does 19 seem really low to anyone? If ANYONE can give me any insight on timing and knowledge me a lil more id reaaaallly appreciate it haha. And also my last period was December 12