Pregnant ...?

How do I bring up to my boyfriend that I might be pregnant? Should I just wait until my missed period and express this concern? We weren’t really trying, but we weren’t preventing it either. We said whatever happens happens. I had a chemical pregnancy in December. my boobs have been super sore for 2 weeks (my boobs are never this sore for more than 3 days). I almost threw up my breakfast yesterday. I had cramps on the left side like 10 days ago. Now I’ve been having light cramps. I’ve been super tired with light headaches. I’ve also been very light headed at random times in the day. My periods due in 2 days. I always always start before noon. I’m really nervous.