Hcg question

What’s the highest hcg level you’ve ever heard of?

I’m wondering because I’m at 71,000 as of last week and now I’m spotting so they’re having me do a 48 hour serial test to see the levels...I feel like after a week of doubling every other day, my levels would be close to 300,000 but that sounds so high and none of the tables I look at have a number that high.