Is it possible to ovulate the week following AF , fall pregnant and experience symptoms that soon ?

AF ended 14th September

Started being sick and feeling nauseous 23rd September

I’ve also had heart burn and I’m extremely emotional and moody

Went to my dr regarding my UTI and she suggested I take a test as she suspects I’m pregnant

I assumed the sickness and nausea was due to the UTI and the heart burn due to the sickness but she didn’t think so

I don’t see how I would be experiencing symptoms that soon