Low HCG levels

Hi ladies! Ok so based off my last period I’d be about 4 weeks pregnant but I’m pretty sure I conceived EXACTLY two weeks ago. My hpt where EXTREMELY faint but there. I have yet to get a dark line. My doctor just called and my HGC levels are at 5.3 ( anything under 5 means not pregnant) but she said it could be that way because I am SO early. I repeat my test tmrw morning to see if it’s increasing or not. What concerns me is because my text were so faint and now it almost looks as if nothing is there. What were your levels at 2 or 3 weeks pregnant (that’s soooo early)