Slow rising Hcg at 7 weeks

lekha

My hcg level at 7 weeks is only 2744. My ovulation is confirmed using u/s ,so 7 weeks is exact. I went for a scan at 6w4days and didn't see anything. They asked to wait. I'm concerned about this slow rising hcg. 6 weeks it was 1850.i don't have any spotting /bleeding /cramps. Should I be worried?