I'm 36 weeks and I get the same pains sometimes- the midwives told me that braxton hicks are not always painless, sometimes they can be like quite intense labour pains.
That's what they told me was happening to me.
I've been worried a couple of times about having my baby too early, becuase I had my first at 36 weeks (luckily she was fine, and healthy) this baby has had her head down in my pelvis all ready to go since about 30 weeks.
The midwives have told me that I needn't worry about aches and pains if they stop of their own accord- like if I change position, or sit/lie down or something. Also, they said not to worry too much about nausea etc unless I can't keep any fluids down. They didn't indicate whether it means I will really go into labour soon or not, so I guess that means you can't really know either way.
They told me to only worry if they increase in frequency, and intensity.
This is all new to me, because last time, my waters broke just out of the blue oine morning, and I was induced the next day becuase contactiopns never started by themselves, there was no guesswork about it.
The suspence is killing me. Every day I get beyond 36 weeks will be a bonus as far as i'm concerned, so i'm not too worried now, although i'm dying to see what my little girl looks like.
Xxx good luck.