Makena shots?

K.Wilson • I am a wife & mother of a 6year old boy. I have had 2 stillbirths at 22&23 weeks and recently a missed misscarriage at 9weeks Nov... Praying for a rainbow baby soon!
Am due to start my Makena shots on the 11th I will be over 17weeks anyone take this shot or have taking it that can give me info on it thanks.