Ectopic?

I am so so scared I might have an ectopic pregnancy, I get pretty painful cramps here and there and I feel like I have to make a bm even though nothings happening. ( that might be constipation lol) ive also been getting light headed. I’m only 5 weeks 5 days so I know it’s still a little early to tell. But I’m so scared that’s what it could be. I sent a message to my dr but she hasn’t gotten back to me yet.