Should I future proof my emergency fund?

As per title, is it recommended to increase my emergency fund in preparation for the future?

I'm 27M and have dreams of starting a family with my girlfriend in the not so near future. Currently I have EF worth 3 months of my monthly salary but I'm not sure if it will be enough once I have a wife and kid, a house loan, maybe car loan, etc. I plan to increase it to 12 months of my current salary but I fear I'm losing out on potential earnings from investments. Can anybody give me insights? Thanks