I'm in shock!?

So I have very irregular periods I have been having unprotected sex with my amazing soon to be fiancé for about a year and 4 months and I know wen I'm going to get my period cause I start getting symptoms exactly 2 weeks before I get it well this time I didn't get my period and I just felt off and basically had morning sickness the last 3 days so I took a test and sure enough I'm pregnant. We haven't been trying but we also are not not trying so if it happens it happens and it happened and idk how to feel. Just looking for some words of encouragement. This is my first.