8 weeks some days

So...I’m currently 8 weeks and some days. I have been in bed since about 5 weeks. Literally so sick. I’ve been feeling better these last few days and when I try to go to the store or anywhere if I stand for too long or walk I feel like I’ll pass out and everything starts to turn blurry and bright. I am hydrated I feel like so idk what this could be. My baby is healthy I just went two days ago and heard the heartbeat. Is it normal to get like this during first trimester.