At this stage you will notice that your uterus tightens and relaxes at sporadic intervals. These are Braxton-Hicks contractions and they happen randomly through the day. If you are busy at work you might not even notice them. This is just your uterus exercising and preparing for labor. Braxton-Hicks contractions are mild, short, sporadic, painless and have no effect on the cervix.
Breathlessness, loss of appetite, acidity and frequent urination are all the symptoms you can expect this week. All this might make you feel very uncomfortable but hang in there, this is going to last only for a few weeks more. It is natural to feel heavy and experience some amount of backache.
At this point, sleep might also be difficult due to nasal congestion. You may find it comfortable to sleep in a semi sitting position as it eases nasal congestion and does not compress the blood supply to the uterus.