Overly sensitive and get emotional everytime

I'm currently in 26 weeks and for the last two weeks, I think I'm overly sensitive. Today was the worst. I went to shop to buy something with my husband. I've been waiting and hoping to buy that item for a long time. unfortunately I can't purchase that item because the promotion time is over. I am so down and can't stand my emotions. As we walked out the store, my tears were streaming down my face. I was so embarrassed and tried to hide it from my husband and others. When we went back home and went to sleep, I cried so hard silently while my husband was sleeping. He doesn't know how sad I am. When I cried, all past event accumulated in my mind and I feel want to explode. I also blamed my husband because he didn't even comfort me. He is not sensitive enough. Lol. I know actually he cares. I am just overly sensitive now. I just feeling sorry for myself and I hate that. I never felt that hurt before. I try my best to control my emotions because I am afraid it will affect the baby. I don't know why I cried so hard over a simple thing. I feel stupid and embarrassed with myself. I am sharing this here because I guess only pregnant moms will understand this situation. As I'm typing this, my eyes haven't dry up yet and the pain is still there. Hopefully I will feel better tomorrow and week to come.