8 weeks and slight cramps

This is my first pregnancy and I'm 8 weeks on Monday. For the last 2 days I have had very slight cramps that come and go. I have read so much on the internet that say growing pains and constipation/gassy pains? But has anyone else had the same or anyone know what it could be? The pain isn't severe at all or not so much like period pains either just slight shooting pains but just below my belly button and then a bit lower sometimes? Any advice please x