Hcg levels?


So I didn't get a firm pos until I was 5 days late(may 6th) for af and had my bloods tested on may 11th to confirm and it was 1270. Is that high to get not even a week after a faint positive? My ultrasound on the 11th showed I was early as only a sac could be seen so I was about 4ish weeks? I'm just curious and have a feeling I might be having twins