Rapid heart rate before BFP?

I had some nausea cramping and back pains this am. I’m around 7DPO. I’ve had off and on cramping for about three days. I got really light headed at work (I’m a nurse). Checked myself and my HR was ranging 120-130s. I’m normally in the 80-90s. My boss basically said to go to urge care or the ED. So I’m sitting in urge care. My HR is down to the low 100s now. Still have cramping and back pain. It’s close to a 2 hour wait for me to actually see someone and I don’t even know if they do blood work here. I’ve read sometimes a faster HR is an early sign. Anyone ever deal with this? I’m normally healthy with no medical conditions 🤷🏼‍♀️