Could I be pregnant?

My boyfriend and I always have unprotected sex and he does finish in me. We are trying to get pregnant now but we just decided we wanted it like a week ago.

My last period (nov 8) only lasted 2 days, they ALWAYS last 5 days. I know they can vary sometimes but mine has always been 5 days for at least the past 4 years.

I also went for a run this morning and it was a route that I normally do fairly easily but today my lungs felt like they were on fire and my mouth tasted like blood.

Should I take a test??