Thanks for the query.
If you are having advanced pregnancy
you can obviously can feel the baby movements and intermittent uterine action. Just by increasing size of the abdomen you cannot come to conclusion that you are pregnant.
This may be pseudocyesis.
You once consult gynecologist and get examined to find out the possibility of pregnancy.
And also you need a ultrasound
once to rule out the possibility of pregnancy.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429