UPDATED: hCG levels?

Da

UPDATE: I got my period this morning, 4 days after stopping the suppositories, estrogen and PIO. On to the next cycle!

As you all know, I had my FET on September 10th - transferred 2 embryos (4AA & 4AB).

I went in for my first BETA on September 18th - 8dp5dt and it came back positive at 15.

I went in on September 21st - 11dp5dt - three days later and it went up to 42.

I went back for a third time on September 23rd and it came back at 46.

They called me later that afternoon to tell me to stop the medications and let it pass since my levels weren’t doubling appropriately.

How long will it take for my hCG levels to get back down to 0?

I’ve read online for people who are over the hundreds or thousands it takes about 4 to 6 weeks to lower to 0. But since my levels were below 50 how long do you think it could take?