Being jealous of Baby?! :( BFP

This may sound horrible which is why it is being posted anonymously.. I just got my BFP and have had feeling of sadness and jealousy that it won't be just myself and my fiancée anymore and his attention will be focused On someone else too. I like that it is just the two of us and we didn't plan for a baby. This may make me sound like a terrible person but it's how I feel and I am wondering if anyone feels the same way. I am 21 years old by the way will be 22 when the baby comes.