Suddenly having nightly romantic dreams about other guys besides my bf, and it has never happened before?

I almost never have Dreams anymore, which alone is strange. When I do, they are usually very basic and realistic. For the past week or so, I have suddenly been having romantic dreams about other men instead of the one I am dating. Quite a few guys, actually, some are friends, some celebrities I do not actually know. They range from simple flirting, to being in love with two guys, and even having with one of my best guy friends. Sometimes my bf is in them, or a guy who I mistake for him. When the last happened, I started to get very bothered by this. I love my boyfriend, and I usually dont have fantasies about any guy but him, nor do I want to. These started around the time we decided to have . Could that be why? It was my idea, and we both spent a few days thinking it over. I feel ready, and I want to stay with him a long time, although I am young. Im still a virgin at the moment. But is that somehow related? Could it mean I am actually not ready? I am so confused by this.