Labor?

Hello i am currently 40 weeks and 1 day last check i still was only a 3/4cm i had been having pain on and off sinve thursday but nothing that stayed consistent. Today i have been having the tightening of my abdomen and when sitting i tend to feel alot of pressure toward my bum and lower belly. But when standing i just get the tightening of my abdomen. I started to time them and they are lasting 40 to 60 seconds and maybe 10 min apart. But is that usual to feel thwm worse while sitting like if something is pushing alot on my butt???? Id really love to be sure this is actual labor beofre i go anywhere bevause unfortunately i have to travel an hour away being dr is not in town once again:(