Started having Braxton Hicks the other night, and have been having them constantly since. Some are…

Started having Braxton Hicks the other night, and have been having them constantly since. Some are painful and more intense. I constantly feel like I'm having extreme menstrual cramps and was put on bed rest last night instead of going to work. I have to start having my weekly checkups now because the doctors are being cautious now that it seems like I may be showing signs of preterm labor. My son is also measuring a week small now, which is also new - he's been measuring fine up until my checkup yesterday. I hope everything is okay, I want to have a full term pregnancy...