Negativity towards SIL who MIGHT be pregnant

I feel horrible. I had a mc 2 weeks ago at 10 weeks. She has been so supportive and helpful as she has gone through this before (has since had a rainbow baby) however I can’t help but think she is pregnant all because she declined a glass of wine. I’m sick over this, why can’t I just be happy for her? Am I crazy to even assume she is? I don’t know how to feel or how to control my emotions. I mean I would be happy but sad, does that make sense? Anyone else in this boat and have these feelings? Any advice for me on how to get over it? I’m just sick with myself for feeling this way.