Walking on eggshells with my daughter in law

My son and his wife have been married for nine months. After they got married I’d call on once a week to see how they were doing. Well, then I got a call from my son telling me that I was calling too much if I could call once month because she not use to getting calls. I felt a little hurt because I thought I was being nice and the calls were short conversation. I’d make the calls when my husband was off so we both say hi. Well they have been try to have a baby. She’s miscarried twice and I called to check on her. That was a mistake because she told my son to me not to call her about it. I respected her wishes and didn’t call. I saw them at a family gathering and I noticed she was glowing and put on some weight. I knew right away she was expecting. I went up and smiled. I asked if she had some news to tell me quietly. Later my stepfather asked my mom if my daughter in law was pregnant because put on some weight out loud. Well you have understand my stepdad is hard of hearing so he talks loud. My mom looks at me and I felt it was not my place to say anything so I shrug my shoulders like I don’t know. This evening I received a nasty call from my son chewing me out saying I told everyone she was pregnant. It wasn’t my place to tell anyone! He told me that I went up to people announcing it. Which wasn’t true at all. I then told him, “you saw me pretty much all evening in my seat.” I never even talk to the people or told no one. I also told him she showing and people probably figured out them selves. Before he hung up he told she was going to have a doctors appointment. I was so mad and hurt. My son is changing so much. I told my husband what had happened. He was so upset that he wanted to call him tell him a few words. I texted him and told him I am going to just stay away and it’s for the best that don’t know anything because I don’t want to be accused of anything or saying anything. I would like some input. She can be very moody and outspoken. I raised my son on my own and he always been respectful and kind. I don’t know anymore.