Birthday gone terribly wrong.

Brittney
Sorry for the long post. 
My husband and I travel for his job. We are 3 hours away from home. My 27th birthday was Sunday, march 5th. Friday we drove home for the weekend to celebrate with friends and family. My husband took me shopping all day Saturday before that evening of dinner with friends and family. My sister was supposed to join us, but backed out last minute. Any ways, Each year for my birthday I have an unusual request of birthday cake. It's the same one every year.  but it's  not your normal birthday cake. Anyways, it has to be homemade. And this year my sister told me she was making it. No problem what's so ever!! I get cake!!! Anyways, I Had the best day ever on Saturday!! Hubby and I got pedicure and manicures and we just really enjoyed our day! We get to the restaurant and we're waiting on everyone before they seat us, my sister and her boyfriend walks in, and doesn't say ANYTHING to me. Now mind you, I haven't seen her in weeks because of her schedule and mine. My sister and I are really close. So for her not to say anything to me, kinda upset me. But we sat down and enjoyed dinner, although my sister and her boyfriend sat way away from me and did not speak to me at all. Before leaving the restaurant, after paying our bill; I was thanking everyone for coming and told them thank you and so fourth. My sister pulled my husband back and was talking to him in private. At this point I was thinking they were throwing me a surprise party. Like party party! I was excited! I've never had a surprise party before! Anyways, I finally talked to my sister gave her and her boyfriend a hug, thanked them for coming and we parted ways. You see, we made plans earlier that day, when she canceled on me, that I could come by on Sunday, before we left town to pick up my presents and cake!! But t apparently things had changed and we were going to their house after dropping off my brother. My husband gets in the car and grabs my hand. Very tightly. He NEVER does that. So my attention to the situation was intrigued. We pulled up to my sisters house and went inside and she had sat us at the counter. I was kinda bummed when I didn't see any ones cars there, no party supplies. So I just sat there looking around. My focuse went to the fridge. And on her fridge, she has this little whiteboard where her boyfriend leaves her notes and vise versa. And I always love reading their notes! It warms my heart! Anyways, in place of these lovely notes was a simple schedule. It read; 
Drs. Appointment : March 14th. 
My first thought was, I wonder what she needs to go to the Drs. for? My husband got up and stood behind me and my sister backed away from frosting my cake. Her and her boyfriend stood directly in front of me. She looked at me and told me they were pregnant. Now my husband and I have been ttc for the past 5 years. Yes, 5 years! Now when she told me this, I couldn't take my eyes off of her. I sat there for a minute. My eyes were filling up with tears and my heart started racing. And all I could say was; well I don't know wether to cry or to hug you!! Of course I did both. I'm so happy for her, but my heart literally hurts. I can feel it breaking. For the longest time, my mom had been asking my husband and I for a grandchild. And now, she finally gets one. But not from me. I have so much resentment in my heart, and I know I shouldn't, because that's my little sister. I told my husband I was ready to go. Gave them all hugs and congratulated the both of them. As soon as I got home, I went straight to the bathroom and cried my eyes out. My husband found me in there and picked me up, undressed me and put me in the bath and bathed me. We went to bed and I cried myself to sleep. Now Sunday comes. My actual birthday. Normally I'm excited for my birthday, each year, I count the days down and everything. But today was different. I turned my phone off, packed our bags, and we proceeded on the three hour trip back to Tuscaloosa, Alabama. I had the worst birthday ever. I didn't say bye to anyone. I didn't return calls. Nothing. When we got back to Tuscaloosa, I took a shower and went to bed. In hopes of a better day today. But still no luck. 
My heart is literally hurting. And I have no idea what to do. I can't bring myself to talk to my sister. I can't bring myself to talk to anyone.