Cramping at 19 weeks pregnant

So it's 6 AM and I've been up since maybe 3 AM with uncomfortable pains. I can't sleep. Got a sharp pain down my leg then My back started hurting so much and I've also been having mild cramping .. kinda like period cramps . Is this normal ? I know I'd experience some cramps very early on in the first trimester but not the second one ???? I got up ,moved around a bit , even to use the restroom the cramping was pretty mild .. grabbed a heating pad for my back ,that's slightly helping .

First time mom . I'm trying to not stress but this is very very uncomfortable . Should I be concerned .?