[ Pregnancy ] Open Question : Is there a chance I could be pregnant?

I had unprotected sex almost 5 months ago. i had my period every month, it was a little heavy. I broke out with a rash on my stomach and i started to panic, b/c it was very weird. i am a week late this month, and i feel like i have your typical pregnancy syptoms would i be showing? and is it possible to have a full period for 4 of the months and still be pregnant?