slightly worried...

i was due on my period 11 days ago, had no signs or symptoms that i’m going to come on. I’ve had unprotected sex with my partner 4 times since my last period but i’ve taken a pregnancy test and it came back negative. i’ve been suffering with morning sickness for the past 2/3 weeks, not physically being sick just feeling sick.

is it worth taking another test and phoning my doctor to see what’s going on?