Confused

So according to my lmp I would be 6w1d, based on the last time I had sex I’d be 18 dpo.

Well I went to the dr for an ultrasound yesterday they couldn’t see anything and suspected I was too early and took blood and said I am pregnant they just don’t know where and we’d get more answers with my hcg level.

I’ve had no spotting or anything and I’ve just been monitoring myself as I have no idea how far along I’d be or what, but I’ve noticed consistent cramping and it just worries me. I’m hoping to get a dr to make sure it’s not ectopic but I can’t help but think maybe the consistent cramp is bad news or could it be implanting still or what? Any help thanks:)