First time momma trouble

Luna

I have another <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a> called pregnancy+ and its telling me I'm 23weeks and 6 days, but this app is saying 23weeks and 3 days. I know it's not that big of a difference but I'm starting to get really bad at remembering how far along I am, and simple information like that, so does anyone recommend <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a> that could help a first time momma keep track of everything, or checklists for hospital bag and other stuff that might be essential that I might not remember?