Trying to be health conscious...

So my husband is five years older than me and we've been married just over a year.   I have a child already and he loves him just as his own.  We talked briefly after our first anniversary about having another child.   I thought he was agreeing and his actions really showed after we talked about it so I thought we were on the same page.  About a month after the initial talk, I researched prenatal vitamins, found a great product and ordered it.  I started taking them on a daily basis and he then noticed them a week into it, in plain site on our kitchen table.   He more or less confronted me about them and I got upset and didn't talk to him for most of the day after that.   As a result, I stopped taking them completely.  Is my husband just too afraid to tell me he doesn't want to be a biological dad to a child? He has it pretty easy so far.   What do I do?