First time mom..

I am a first time mom, high risk pregnant. I was carrying twins but twin b had her demise at about 28 weeks. That being said I am currently 34 weeks and have had lower abdominal cramping and lower back pain since about 1:00pm this afternoon. I am unsure if this is a sign of early labor or just braxton hicks...any help would be greatly appreciated.

Also, I've noticed the remaining twin's activity level and routine have changed the past two days. She is normally very active all day and then quite at night. Now she has been active in the morning but quite in the evening. If I push on my abdomen and pester her she will then lightly move. I'm just confused as to what is going on.

Should I call my doctor and go in? Thanks for reading and commenting.