How to change your due date on this app?

Britney • I'm a happily married to the love of my life and I'm a 27 year old who is graduating university soon this year and is hoping to start having some beautiful babies soon! We have had one pregnancy and miscarriage at 7 weeks so far hoping for a rainbow baby
I'm currently trying to concieve but my app keeps thinking I'm pregnant but I'm not yet haha is there a way to reset the due date or set it to ttc? I got my af and want to start it again thanks!