Anyone else worried?

We are 4 weeks pregnant currently with our rainbow baby. I'm terrified that we will lose this baby too. I know there is nothing we can do but pray and try not to worry. I've not had symptoms this time (yet) and with the last pregnancy (ended in MC in February 2016 at 8 weeks) I was having symptoms before we found out at the four week mark... and that worries me. I'm hoping I'm just working myself up for nothing but I can't help but feel so scared that this baby will just disappear. :( this is our 5th pregnancy (3 successful) so I know all pregnancies are different but I'm just so anxious and worried.