What to put on the calendar??

Leeann • Im 19 with a 2 yr old son and had a daughter before him but she sadly passed away after a week. Im with a different man now whom i love to death and he`s great with my son. We`d like a baby of our own
I missed my period and glow asked me to update it and asked if my period started today but it hasn't, instead now it switched to this week and says it starts in 2 days. I think I may be pregnant (hoping) just waiting longer to take a test. So lol idk what to put on the calendar or how to follow it,help?