Congratulations! We switched you to pregnancy tracking mode!
All my information disappeared...
18 months later my period comes back after I stop nursing...
Guess what! Date of conception in my app says the date I gave my ob as the first day of my last period. What the heck 
do a paternity test and find out that for 18 months the wrong mam has been told he was my child's father! Turns out what I thought was my period was implantation bleeding, having irregular periods it didn't even phase me that it wasn't a lot.
If this information had been available the entire time so much heart ache would have been avoided. I'm soooo grateful and think it's soooo cool my watch knew this information and we could correct it but I will always feel so terrible that my daughter and her actual father missed so much time together for my error.
The last period is very important to the pregnancy and if my watch/app KNEW the date of conception THAT should have been on my pregnancy tracking. Also sexual activities and ovulation information shouldn't disappear either..
Thank you again so much, very cool- everything is fine but still very sad..