<human>: My SO recently switched birth control from an implant to "Yasmin" brand preventional pills after the implant failed and we had an abortion.

Now, each time she is pre-menstrual and during her period, she is an emotional wreck. However terrible I feel for calling her this, this is the case.

I've known her for a couple of years, and we have been together for aprx. 10 months. I'm 28, she's 34. I know what she is like, and I know her moods, but this is different. 

She doubts herself, my love for her, claims she is unattractive and that I never compliment her looks (almost every day I tell her how beautiful she is, and how much I love her) and today one of her friends told me that she has had sucidal thoughts during these bouts.

I really don't know how to approach this. This is in many ways my first serious relationship, in the fact that this is the first time i'm with someone that I can say that I want to build a future with.

One of these phases started yesterday, and I dont know what to do right now. She says she doesn't feel loved, and it's breaking my heart. 
I've learned the hard way that you can't comment on premenstrual behaviour as a guy. This is frowned upon in many cases. What can I do?

Today she hasen't spoken to me at all, after several attempts from my side. Right now she left me at home to hit the bars. I know she's definitly not cheating, but this hurts. We're a really loving couple the other weeks of the month, and we had been for along time before the change of medication

Can you succinctly summarize the text in 1-3 sentences?
<bot>: SO changed birth control, is now depressed and feels like I don't love her anymore. How can I approach the issue delicatly?