Pregnant again?!

So I just found out I’m pregnant again it’s very early still I’m not even sure when my period is due I don’t feel like I ovulated whenever I should have but if no issues this will be baby 3) My oldest is 8years and my baby is 8.5months... we had tons of fertility issues including 2 mc and it took us forever to have baby #2 and now I’m shocked as hell and in some denial about it. Both kids were via csections and I know I have to have a 3rd section now but it’s under the year mark and i just turned 39! Anyone else in the same boat? Or have had their csection a close? I’m terrified of complications... and I don’t know why but I’m also feeling like this pregnancy was so unexpected that I feel it will go wrong and I’ll mc... don’t get me wrong I had thought I wanted a third or to try but thought It would never happen especially since our history but never did I think It could so fast ... i know I’m happy also but so terrified at the same time..