Preparing significant other for unplanned pregnancy

I just found out I was pregnant today. Still in a little bit of shock and disbelief as it was NOT planned.

My fiancé and I just booked our venue for our wedding next summer, we’re both still attending school (we decided to both go back a few years ago) and lowered our income because of it. Needless to say, I’m worried about his reaction being very unhappy with the news since we already have a lot going on.

Any tips or tricks to deal with this?