Need help with glow!

Jamie • Hey all I`m currently ttc my third baby. .i have a son and daughter from a previous relationship! Thought ide try this app out for help and support!
I just stated using glow only have one period put in from Sept which was my d&c bleeding if that makes a different just started my period today and when I put it in to glow it tells me I'm gonna ovulate in 7 days?? Can I change it? Or do I have yo have more cycles added so the app knows what's going on?