Fatigue, hot flashes, and low blood pressure in early pregnancy

So, at 5wk 2days I started getting hot flashes at night. That has continued. I then caught a cold and went to the minute clinic at 5wk 4days just to make sure it was not strep. It wasn't, more than likely a virus. When my BP was taken it was 100/60. They told me to drink fluids... however, I have been drinking ALOT of fluids. They told me to go to the ER and my BP was normal when I went. This last week I am always thirsty, always tired, and having this cold in addition to this is really kicking my butt. I also have lightheadedness however I can't really determine whether that symptom is telling me  my BP is low or if it is just from being sick. Everything I have read about hot flashes and lower BP during pregnancy indicates these symptoms can be a result of higher progesterone levels. I have my next US scheduled for next week at 6wk 4days and plan to discuss all of this with my doctor. Has anyone else experienced any similar symptoms this early into their pregnancy?