With my first I was about 29-30 weeks and now with my second i was about 25-26 weeks, if you think your showing that early you might be abit bloated? I was, but my belly didn't actually show a baby until alot further along :)
You probably aren't showing. Baby doesn't appear over your pubic bone till week 12. Most women show between week 14-22. Everyone is different. Skinner women and women who have had children already will show earlier. It's mostly just bloat at this point. I'm 11 weeks and I feel like I'm showing because I look huge! I know I'm not though haha. I started looking bloated around your time too.
I got my bump around 4months also