3rd pregnancy. 19w 3 d.

For 4 hrs I keep having sharp “contraction” pains on my left side. Every now and then on the right. I have had quite the busy day, but nothing out of the norm of my usually daily life with two toddlers. Made sure to drink plenty of fluids as always. They last for about 10 seconds and then go away and pop up about every 5 minutes. Should I be concerned? Not really wanting to go to ER. We’re suppose to have a anatomy scan Wednesday.