How much how fast is too fast?

I have PCOS, I weighed in Jan 30 when I ordered my meds at 198.

6 weeks, 2.5 for 4 weeks, 5 for the last two, probably going back down to 2.5 going forward, because I got horrible nausea and liquid.

I’m 146. I’ve lost 52 lbs in 6 weeks, 8.6 a week. I feel like this isn’t normal.