Swimming in deep waters

I just finished swimming in a pool with family this weekend and was wondering if it was ok for me to go in the deep end. I felt a lot of pressure on my tummy, felt heavier, and losing my breathe a little. Is it ok if I went into the deeper area of the pool? I know this may be a dumb question but I'm a first time mom and just needed assurance. All answers are highly appreciated. Thank you!