4th pregnancy feeling large and in charge!

After having three girls my husband and I decided that while we would love a Son we felt our family was complete so started getting very careful with contraceptive, I started working out in order to get my pre-baby body back etc. Needless to say we were both in shock when the at home test revealed we were expecting a 4th child. I keep having dreams about twins, am having extreme hot/cold flashes like I've never experienced before and am having a hard time catching my breath frequently. Am definitely getting that baby pooch earlier than in my past pregnancies as well...kind of freaks me out! I know it's not bloat because it's already getting very stiff and tight too. Our first ultrasound will be Nov. 3rd and with my calculations I will be around 9 weeks then. Very anxious!