I have been having a weird feeling in my tummy, like if the middle and upper part area are in a knot. It kinda comes and goes through out the day. It's very low pain, but just feels weird. I ovulated 6/14 and since 6/16 I've been feeling this. Could I be pregnant? Has this happened to any of you?

I remember with my 2nd child six years ago, I was having some weird feelings with my tummy too, until someone advised me to take a pregnancy test, but I can't remember if this was the same feeling as last pregnancy.