I totally feel the same way you do. I just had my 12 week appointment today and we heard the heartbeat with the doppler. It was in the 170's, perfectly normal. I have had plenty of unwanted symptoms the entire pregnancy - nausea 24/7, vomiting every few days. But, for some reason with this pregnancy I just keep thinking in the back of my head that something's going to go wrong! I have no idea why. I think it's probably because with my son we tried for 8 months to get pregnant, and with this one we weren't even trying yet for another one! It just happened! So, maybe I just think it's too good to be true or something? I don't know, but I totally feel where you're coming from with the worrying.
It's all normal! I was sooo paranoid too and was a ball of nerves for the first few weeks up until my 12 week scan! The day before and day of my scan I was soooo nervous and scared! I vented about it and was told by many people that they felt the same way. I agree that when you see on here about many miscarriages and horror stories and you think of it happening to you!
I'm sure everything is fine! When I did go for my 12 week scan...my baby was perfect and flipping around! Try not to fret too much!
I think it's completely normal, no matter how many pregnancies you go through you're a mom and moms worry. There's always going to be those "what if" questions, or those "hold your breath" moments when the doctor gives you the results of this test or that one, or the "is there a heartbeat" EVERY time you get an ultrasound, or they use the doppler...I think it's part of pregnancy. BUT truth be told, there's NOTHING you can do ahead of time to prevent anything from happening if it were to, SO the best thing to do is enjoy your pregnancy, take a deep breath, tell yourself everything is fine, and worry about things IF/as they come. :)
I suppose it's just nerves.. Reading many posts or reading online about others having a miscarriage is scary and you think it can happen to you. Please relax. You don't want to stress yourself out so much that it's affecting your baby.
Your almost to a new trimester and the miscarriage rate drops. Enjoy your pregnancy. And no worrying. I'm sorry you feel this way! Try to stay positive.