pregnant after stillbirth

so I found out last Friday (the 18th) that I'm pregnant. last year June 14th our baby girl was born sleeping three days past her due date. I am terrified that something will happen with this pregnancy. I have three beautiful kids 15,9 and 8. I also had a MC in 2016. so I am worried about everything right now. I have symptoms but they seem to come and go is that normal? I feel nauseous off and on during the day. I have taken 6 tests so I can keep seeing that line. am I crazy? or should I just embrace the moment and relax until my appt on the 4th?