Hi, welcome to healthcare magic.
The symptoms you mention and much more are non specific and not sufficient to diagnose pregnancy
To diagnose pregnancy you should first miss your period then confirm by a blood test
, followed by ultrasound
examination at the proper time.
My advice is to have an ultrasound scan on you pelvis and abdomen, maybe there is a cause for this pain. If the scan is normal so there is nothing to worry about and start a program to loose weight.
If these symptoms persisit I recommend visiting an internist.
I hope these words were useful and good luck.
Dr. Ahmed Bahaa.