Headaches shortness of breath rapid heartbeat

I am 29 weeks pregnant with my first child I can walk to the bathroom and back to the bed and I am shortness of breath take a shower I lay down I'm shortness of breath anytime I eat I have a rapid heart rate and shortness of breath sometimes it is worrying me I'm going to call the doctor tomorrow but I just wanted to know if anybody else had the same symptoms or if this is normal I also havesevere headaches