I have the same thing. It happens when I stand up or sit up too fast, sometimes. Try pulling your knees up when you feel like you are to cough or sneeze. It seems to help.
I also have that. Not sure why.
It's probably just from your ligaments stretching due to your growing uterus.
I had that with all three of my pregnancies, it's normal. Holding your stomach when you feel it coming helps.
I had the same thing today when sneezing it felt awful. But settled down straight after and been feeling normal tonight. Also first time mum and Im 7 weeks
It's called round ligimament pain, very common I have it too and I'm 10 weeks +5 :)