It's a hard question to answer because BC is such an individual thing. What works for one, will not really work for the other. I have 10 years on your partner and have had a few trials before I found what worked for me. The rule of thumb is to give it at least 2 months and usually 3-4 to see if it changes and things settle down. It takes the body that long to adjust and catch up with the changes in hormones.
Drinking more water helps with getting rid of water or an OTC diuretic too. There's lots of herbal ones you can buy.
Yasmin is the one I settled on. It has horrible press but has been good for me.