When to worry about ectopic

Hi all I'm 6 weeks today and a bit worried.
I haven't had any pregnancy symptoms.
I'm not tired or sick or anything. Just had positive tests and no period. GP said that's all normal and just to wait for midwife appt which is in 3 weeks.
But I have had really mild cramping, always on my left side like period cramps but very minor. The odd twinge on the left too.
Today however the twinge is stronger and coming every 5 mins or so like a pulse. It's not agony but it's noticeable.
A
At what point do you flag up if you think something is wrong? Is it just a matter of waiting or phoning emergency if it's suddenly worse? I don't want to flap over nothing but I do want to be early to get help if something's wrong.