Pregnant or over thinking?

My ex and I had unprotected sex about 6 weeks ago and he came inside me. I got my period 4 days later but it was lighter than normal. I also got my period this month but it was again lighter than it usually is. I have also noticed a difference in the smell of my urine. Could I be pregnant or am I just over thinking.

I have not yat taken a pregnancy test but will be picking one up the next time I go to the store.