I just got my first depo shot and I am really sad because ii want to have a baby I dot know why ii did this I can't stop crying

I just got off my cycle the same day got the depo and that was a mistake because my fiancé is really mad at me because he wants kids now... they told me not to have sex within the first 7 days but I'm going to have sex every day because we want a baby... I feel really bad bexause I should have talked to him before I got it.