How would you feel/respond?

My husband and I have been together for roughly 4 years. When I met him, I also met his best friend who he has been friends with for over 20 years, and I met his best friends girlfriend. Me and her hit it off pretty good, until I found out the real her. She ALWAYS was competitive with me. Anything I had or did, she had to do or have better. So fast forward 3 years to this summer. I tried to push our differences aside for my husband. We all met and went out to eat. By this time we had been trying to conceive for about 5-6 months. She was complaining because she wants kids but her boyfriend doesn't. I then proceed to tell her we had been trying for awhile with no luck, she tells me that she is infertile and has to go on fertility drugs to conceive. The very next month after telling her my husband and I have been trying for awhile, she magically gets pregnant (even though she swore they have sex 2 times a month because my haubands best friend doesn't want kids). So here I am, still not pregnant, she is 23 weeks, and rubbing it in my face hard. She messaged me Monday asking if I knew of any good stretch mark cream. Ummmm NO im TINY and have also never been pregnant, why would I know of any? A few days later I come home and there is a pile of clothes on my couch. I ask my husband what this is and he said she sent them to me because she can't fit in them anymore. I was like no kidding, she's pregnant, of course she can't fit in them. Then she messages me saying "Did you try those clothes on, my baby bump is getting to big and I can barely wear them anymore so I figured I would send them to you instead of letting them sit around". Are you kidding me.. I'm so upset. She knows how bad I want a child and yet she continues to rub it in my face that I can't have one and that she could.. Another thing, my husband and I rarely get to see each other. Today was the first day we could've done anything together in over a week due to our jobs. He redid our flooring last week, low and behold, she decided she wanted her floors re done since mine were. She goes and buys flooring and asks my husband to help them put it down. He said he would sometime next week, but she insisted it be done this weekend, so now I probably won't see him until tonight, and it'll be to late to do anything. (He can't say no to people, he's to nice). I'm to the point where I feel like she is completely trying to make me feel like a crappy women because I can't have a child. We are 22 years old and she is acting like a 10 year old.. It literally consumes me and idk how to break this viscous cycle. I literally want to cry every time she rubs her pregnancy in my face because she is constantly putting that reminder in my head. That I still haven't gotten pregnant.. What would you all do..