Dont know whats going on

Rose
So on the 4/12 my HCG levels came back 50.1 then on the 4/15 went back and they came back 160.2 then went back on 4/19 and they came back 336.27 is this good on the 4/19 I also got ultrasound and they didn't see anything when I went the first time on 4/12 the doctor said I was 5 weeks one day but I think am less or I don't know what's going on