In-Laws

So i am currently 6 months pregnant. My SO’s grandmother (she raised him, he didn’t have his parents in his life) has been SOO weird to me since i announced i was pregnant. Before she would talk to me all the time and since my SO told her she hasn’t spoken ONE WORD to me, hasn’t asked about how the baby is doing, not even asked my SO about the baby. Showed her ultrasound photos, still said nothing, just gave them back. Hasn’t even bought baby girl anything (which really doesn’t matter to me bc i buy enough for her as does my family members. just stating she hasn’t bought a single thing for her). we just went to a memorial day gathering with all her siblings. My SO refers to all of them as his aunts and uncles instead of “great aunts and uncles” and for the past four years we’ve been dating they all absolutely adored me, would purposely greet me first, be nicer to me than my SO and even joke with him they liked me more than him. Well at this memorial day gathering every single one of his aunts and uncles walked directly past me acting as if i didn’t even exist. This was shocking to me because in the four years of being with my SO they have NEVER not acknowledged me. My SO and i stayed for about 10-15 more minutes waiting for them to make their way to us to maybe say hi but nothing finally i got frustrated and we left, i could tell it upset him too but i don’t understand why they are acting like this towards me now that i am pregnant. I know my hormones are crazy so i may sound like i’m over reacting but it’s actually getting really hurtful going to his family events and being ignored by everyone for absolutely no reason. Sorry for the long rant/ post don’t really have friends i could confide in and i’m not sure if any of you ladies have delt with anything similar!

JUST ADDING: I saw a few comments and since i wish to remain anonymous we are engaged & his family is not religious, AT ALL which is why none of it makes any sense to me.