Mild pain in tummy in second trimester

[91mana]

I am 16 weeks + 5 days pregnant and it is my first pregnancy. For the first time this morning, I woke up with mild pain in my tummy. The pain feels like a knife is going through the center of my tummy. It was on and off for 2 hours but after 3 hours it is back. Again, the pain is very mild and is on and off. Should I reach my midwife or this is the time in my pregnancy when I should expect such pain?

I am experiencing the same thing, booked a scan for this afternoon as my anxiety cannot cope:(

I had cramps throughout pregnancy but I'd call your assessment centre just in case