Hcg blood test?

Makeup • 3308/103011/061115
I went in yesterday for a blood pregnancy test and got called back this morning, my hcg level is 137 she said that's low and not where they want it to be ? she said to take precautions for possible miscarriage. I have to go back in on Monday to retest. With my daughter it was 149 and they told me the same thing I'm hopping that this is the case this time around. Anyone got there levels back? I'm 4w 1d