Hiya, I had rosacea flare up a lot in the second trimester and it hasn't gone away, but I spent a long time researching products and it has calmed down a lot with what I've bought. I didn't want to go to the doctor and get anything for it while pregnant, even if only a topical gel.
I think the products that will work for you can be very individual and depends on what sort of rosacea you have - mine is mostly acne rosacea on the nose (gets v inflamed) with a little flakiness as well on my cheeks.
The anti-redness avene range is good (it's in boots) and I use the redness relief cleansing milk to wash my face, it's really gentle. Only pat dry with a towel, never roughly wipe.
Moisturizer I use kalme day cream - it's only online and website looks a bit dodgy. It's legit though and it had an immediate and the greatest effect on my inflammation.
After applying that, clinique's anti redness range - daily protective base is brill and then lastly if you wear makeup they have a good anti red foundation too.
Sorry for the long msg but it took me a long time to find stuff that worked so I'm keen to share to help others!! Hope you find something that suits you, rosacea is rubbish!