I'm not sure I'm ready

Over the last year or so, my husband and I have been trying to get pregnant. We've only been married for 5 months (together for 5 years, known for 10 years) and haven't been successful yet. However, things lately seem different in our marriage.

A few weeks ago (before our honeymoon) I thought that he was talking to an ex girlfriend who he had told me he hadn't spoken to since before we got together, so when I confronted him about it, he got pissed off, punched a hole in the wall, pointed a finger in my face and talked down to me like I was a small child. I didn't tell him to get his finger out of my face in fear he might do something. Then, last week while driving (he drives recklessly) I was telling him to slow down as usual and told me that I need to go on meds that would knock me out so he wouldn't have to listen to me. He's been overly affectionate as of last night, which is his way of "apologizing" without verbally saying he's sorry. Since stuff just seems to continue doing down hill, I'm not sure that I'm ready to have kids yet, but I'm afraid to say something to him because I know he will verbally lash out. Any advice?