Am i being selfish?

I just found out im 4 weeks and 3 days pregnant yesterday. In my marriage this is our first baby. Im cramping in places im already vomiting like crazy. I told my husband last night and hes so excited he wants to make love. He asked again this morning. I told him baby right now... thats kind of not what im thinking about. I apologized to him. I feel like im being selfish because i never tell him no. Am i thinking of myself?