How far could I really be?!

I recently found out I was expecting again but really curious how far I could be! My last period was kind of different so I just counted it as a period and never thought anything of it but then the next month I took a test and it was positive and I didn't get my next period. If that last period was an actual period then I would only be 4 weeks and 4 days today but to me and others I don't look 4 weeks. Everyone has asked if I'm a few months actually! Some thought I was pregnant before even taking them. So, my question is! How far do ya'll think I am?! Do I look father then 4weeks? I'm so curious because my very first drs app isn't till end Jan and if I'm farther along then I think then I need to get in soon.