Pregnant with cycle?

Sherriedra
I had faint light spotting a week before my cycle... My question is can u be preggers and still have your cycle? My friend who is small like me came over with the biggest belly and moving baby... She said she had just found out she was pregnant and 5 months and didn't know.... Saying she still had her cycle.... I don't want this to happen to me. I had a hard time knowing I was preggers the first time.... I have nausea most and vomiting some mornings. Cramping in my hips and lower back.... I feel gassy and like spams in my stomach but I really think I'm being paranoid... My love asked y my boobs were juicy and I been asked twice if I was preggers. Should I be concerned or jus wait it out?