pregnant and on my period at the same time?

I had my last 2 periods on Sept. 19th, & Oct. 19th, so I was thinking I would have my next period on Nov. 19th, but instead it was like 2-3 days late. I also had unprotected sexs 2 weeks ago, so right now im on my period.. but I still feel sick in the mornings, and I don't know why.. but I feel like really full, like I just got done eatting a big meal or something.. and I feel like this all day. So could I actually still be pregnant, and be on my period... or no? I'm thinking there's no way I could be pregnant.. and be on my period.. but why do I feel sick only in the mornings.. and so on?

HELP! =]

PS: Should I take a test, and if so... should I wait til my period stops.. or what? when should I take it? or should I take it? sorry about all the questions!