Week late...

Hi ladies! So I am a week late. My cycle is really normal. I'm super active and healthy so my periods always come on time. I was nauseous for 7 days straight last week off and on. Not consecutively. I'm not nauseous at all this week and don't have any other symptoms. Could I be pregnant? I have a friend currently who is due in a month and she said she didn't have any symptoms at all either and was 4 weeks pregnant already when her period was supposed to start. Anyone have a similar experience?