Worried, again

I don't know why, but this pregnancy has worried me from the beginning. I have been anxious about the health of this baby. At my first appt, the doc couldn't find the heartbeat with the doppler, so he did an ultrasound. Still couldn't find it, so he scheduled an emergency ultrasound for that same day. Luckily, we saw it and I let go of the panic that had been trying to creep in. I have just always had this nagging feeling in the back of my mind that something might not be quite right with this tiny baby bean. At my regular ultrasound, everything looked good, so I began to breathe easier. This morning, I got a call from the nurse saying that the doctor looked over my results and there wasn't a good picture of the baby's heart. They can't see all four chambers. They are referring me to a specialist maternal fetal medicine place for another ultrasound in hopes of finding what they need to find. I am not super worried yet, because the tech doing the u/s did mention that the way Baby was lying (sideways, back up) was making it hard to see everything. But, it does make me wonder if the feelings I've had so far have been more of a warning that just me being paranoid.