Oral progesterone until 13 weeks...help

Anyone have any experience with this? My doctor called to let me know my levels are rising but not quickly enough for his liking. He put me on 200mg of micronized progesterone once daily.

I have to take it until 13 weeks.

I’m wondering if this has been successful for people or if there are any side effects to look out for? I asked him about side effects and he said “the only side effect is a successful pregnancy” so I’m just curious if there’s anything else lol