Welcome to HCM.
Your last LMP was on 14/06/12 and your pregnancy
test was positive.
Your beta HCG
value was 108 on 16th July and 270 on 19th July.
So you were carrying of 5wks plus pregnancy.
Around 5wks normal value of beta hcg is 18 - 7,340 mIU/ml. Your hcg level seems to Low Normal.
Low normal HCG has some possible risk like ectopic pregnancy or early miscarriage
. From that point of view,your doctor told you to repeat the test for beta HCG again. But your clinical presentation is not likely with that.
Better you can do a USG scan for evaluating fetal profile along with location of conception.
After that you can consult with your doctor.