Shoulder pain 4 weeks

I tested positive 3 weeks 3 days. I was fatigue and had tender breasts. Today I am 4 weeks 1 day. My first blood test is tomorrow. My first dr apt is Monday. I have no more symptoms. Yesterday night I was randomly having shoulder pain that would last 2 seconds. My dr said it could be gas, muscle spasms or my body changing. I’m nervous about an ectopic pregnancy. My dr said a blood test or sono will not show anything because I am so early.

I had an ectopic pregnancy in the past and the way I found out was my levels went down in my second blood test.