Newbie Here!

Kristi • 35, 👶🏼 2years old, MMC at 12 weeks, 2 CP, 🌈 due 05/2020
Newbie here! 
I found out I was pregnant less then 12 hours ago!! I am 13 DPO today and  waiting for my doc appointment on Friday. 
I already have so many questions:
1) I have had a cramp like pressure (what I thought were period cramps) for about 4 days. What is this? 
2) any tips or tricks for us to keep baby? So many people around me have had early losses and I want to do everything I can to avoid one 
3) I know food aversion and nausea are common symptoms in the first trimester when should I expect this?
4) if you could go back in time what do you wish someone told you at the stage?
Comments, advice, experiences are all welcome!