Could i be pregnant and still have a period?

I still have my period like clockwork with all the normal pms symptoms and cramping. I havent been gaining weight, but I am hungry and moody a lot more lately but i think this is due to the fact that i am really stressed lately from a lot of changes in my life recently. i don't have any pregnancy symptoms but sometimes it's like i feel something moving in my stomach all the way through to my back and in my ribs. its nothing sharp just movement. i have this impending feeling of being pregnant. but my bf and i always use protection, plus we hardly ever do it. maybe once a month. i hear all these horror stories of women being pregnant and not knowing, so i'm just curious. please no mean answers. i appreciate any kind answers from women who know a little more about this. thanks!