Thanks for writing your query.
It will be helpful if you give more information about your last menstruation
After reading your post, I would like to suggest that you should get an Ultrasound
done to know the cause of your abdominal swelling.Pregnancy
seems unlikely as you have mentioned that your swelling is on the right side of the abdomen.
I would also advise that you should get yourself clinically examined and investigated.
I hope this is helpful to you.