Slow rising hcg levels?

Sierra

I’m so worried that I’m going to miscarry or I have an ectopic. I’m not sure how far along I am as I went to the er today they did a sono and couldn’t see anything. Problem is I’m cramping on my right side near my hip NOT BLEEDING (yet) but Monday my levels were 34 and today they were 46 which was only a 35% increase I’ve never had my blood drawn before with my other 2 kids so I don’t know what to expect. But they want me to go back next week for blood work and go on the 17th for another sono. My lmp was 5/2/20 my cycles are irregular so I might have not even missed my “period”. Could I be the one to double every 72 hrs and not 48 hrs?