Periods since LLETZ

I had LLETZ 24th march results CIN3 no comments on margins or depth taken in report I was sent 

had a normal period in April on time but this month I'm already a week late .. have all the symptoms as if I'm on my period but just no bleeding ! Instead lots of cervical musus instead  pregnancy tests negative .. 

I was just wondering if this the norm or if I needed to consult my doctor