Pregnant around negativity

I just recently got married but a couple months before my husband and I thought we were ready to start a family. Well after getting married the conversations have been about when I'm going to get pregnant. At that point I'm already 12 weeks pregnant. I didn't want to bring it up yet but in the midst of this conversation we are told to wait and not have any children yet. Meanwhile my husband and I just shook our heads and smiled in agreement. Just this past week we had our first prenatal appointment due to insurance reasons and we got to hear the baby's heart beat... it was the most beautiful sound I've ever heard and was so excited to share the news but wanted to wait for a cute way to do it. Well on Thursday my sister-in-law had her baby and we went to go see her and my mil was talking about how we shouldn't have kids just yet and to wait and enjoy our lives. So it kind if just kills the excitement of sharing the news. & to top it off today I met this lady who asked me if I had kids and I told her no and said good, have kids if you want a headache, pains and no sleep. They aren't even worth it.. I just stared at her and smiled. I know better to let this get to me but I can't help but feel that this negativity can affect the way I want to announce I'm pregnant. I'm thinking of just keeping it to myself until I can't hide it any longer. Have people assume I'm fat..lol.