Past two days

Kimberly🚮🚮😘 • Momma to Orion, Taurus, opinionated (sorry)
I have been unbelievably tired, today I had two contractions I guess, they were in my back and only lasted 30 seconds. I have been nauseous all day. As well as have a slight headache. I'm 36 weeks and 3cm dilated. My doctor said baby is already really low also. I just woke up from a nap and already feel like I haven't slept in a week 😥 could my body already be preparing for labor and making me sleepy like this? Like maybe it knows it's about to go through hell? Idk any advice is appreciated.