Should I worry about ectopic

I got pregnant after taking a plan b and have had some spotting and light cramping inconsistently with one day break in between for 4 days. My doctor won’t schedule an ultrasound until the 11th. I’m terrified of an ectopic because of the spotting and read that plan b can increase the risk. My doctor said it can be normal. Should I go to the er or wait it out until I have more symptoms.

I know ectopic can be rare but still very scary