Just Need to Vent!

Yesterday my husband told about our 2nd pregnancy to his mother. His mother didn't want us to marry because she only wants to grab money from his son(my husband) as he works in a foreign country where both of us live. After 2 years of wedding I convinced him to plan our first baby as he just wanted to support his mother and brothers (who afe also eatning and all elder from him) first and was postponing our family planning. As of now my first son is 10months old and m 18weeks pregnant, my MIL's reaction was "It's too early for a second baby. It's not good for the development of the first one also it will financially burden you." I am really hurt after hearing this all. My husband is really happy for our 2nd one as he thinks our babies would be the best friends this way. I even cannot sleep by knowing my MIL's remarks. Who she is to tell her son when to have the next baby. I'm 34 years old. Also my MIL ruined some precious years of my life by prolonging our engagement by 5 years then my husband took stand and we got married finally which she and her daughter really hate. Am I being overly sensitive by her remarks on our current pregnany?