I’m pregnant and terrified to tell my parents. Any advice?

I’m 26 and I’ve been with my partner for nearly 2 years and we’re engaged. I know this sounds ridiculous but my parents are super strict and don’t approve of my partner and also don’t approve of children before marriage. I’ve tried to get my mum to be more understanding of the times and that things aren’t the way they were when she was my age. I’m terrified to tell her. However this is something my partner and I both wanted so we are completely ecstatic about it.
I’m pregnant and terrified to tell my parents. Any advice?
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