Please help

Hey ladies. I'm 25 years old and have a son whose 2 years old now. So I have had a round of test done by a fertility specialist and looks like I have 3 problems.

1) thyroid under active (on levothyroxin 50 mcg for a month now)

2) ovulate late in my cycle (CD 21) so I'm being put on

fertility medication for it (not sure what yet)

3) low progesterone levels (period starts at 9 dpo, will be put on meds)

I am overwhelmed with all this information and not sure how to process it. With my son I had no problems. How can so much change in 2-3 years?

What are my chances getting pregnant this month?

Would love to hear success stories or even just some positive vibes or motivation. What should I expect from here on out?