Yelling and Braxton hicks

I just cut my 15 month olds hair and then my 3.5 year olds hair while sitting in the tub with them. The baby was super quick and easy the 3yo has been having attitude all day and talking back and not listening 😫 this is not normal of him. I’m so tired of yelling. I don’t spank him and I can’t control my yelling the passed few days now I’m having bad Braxton Hicks contractions it’s so uncomfortable. Do you talk to your doctor about this? I feel like I’m yelling too much. On top of everything I recently been having more sciatica pain and back and pelvic pain so carrying my 1.5 year old up and down 16 stairs in our house has been so bad it’s stressing me out being in so much pain and I’m barely 28 weeks! My boys were 9.5 and 10.5 pounds I’m so nervous I skipped my last appointment because one of the doctors at my clinic had covid. I plan to skip the next one but should I call?