Further along

What are the chances that you could be further along then what you think technically my last period was April 10 it was really light and only last two days. So according to that I'm 5 weeks today I know my stomach is probably bloat but I just feel like I'm having to many symptoms to only be five weeks and I can already feel my body changing so much, plus my jeans already barely button and have been getting more snug for the past 3 weeks. What do ya'll think?