is it possible to be pregnant and still have a period?

Dianna • I am a 1st time mom to a beautiful baby boy. His temperament is calm. He is 16 months now. I am a stay at home mom.
I was late last month 3 days, then I had a very light period lasted usual 3 days. Before that usual every month. I feel something moving around inside my belly, like someone is doing summer saults. Could I just be having gas moving in my intestines? Very strong the last 3 days. It happens every time I lay down. Something starts moving around?