Baby bump at 5-6 weeks?

So I just recently found out I'm pregnant. I figured how far along I am according to my last period, however, my last period was a week earlier than usual and was way lighter than normal. I kind of wonder if it was implantation bleeding rather than an actual period. So far I've read that most people don't start showing till around week 12  and on but I'm not really sure how far along I am.
Based on calculating from my last peiod (the week early and light one) I should be around 6 weeks and 6 days. 
But if I base it on the peiod before the light cycle I would be about 10 -11 weeks.
I guess I'm just wondering if perhaps I really am further along. So far based on my belly I can't really tell if I'm begining to bump or if I'm just fat lol. I have a doctor appointment in 2 weeks and by then I'll definately know based on measurements but I'd still kinda like to get others opinion ahead of time so I know where I am on the time line. Please let me know what you think. Did any of you show before 12 weeks with first pregnancy? Any tips/advice would help.