Switch to formula?

My baby is almost 6 weeks old she is EBF, she went 6 days without pooping which I know can be normal, on day 6 she seemed fussy so we tried a suppository as suggested by her pediatrician. She pooped 8 hours later and only about the size of a 50 cent piece. She was no longer fussy. Now she has only peed 4 times in 24 hrs. Now I’m worried she isn’t getting enough milk. Anyone else been through this? We will be going to her pediatrician tomorrow.