Ay nak, please go to your OB or emergency agad if you're worried, hindi dapat maghintay with anything unusual sa pregnancy, okay?
At 8 weeks, ang baby pa talaga ay very tiny (grain of rice lang), so unlikely yan ang bump you're feeling. Could be maraming things, maybe ligament stretching, gas, or something else entirely, pero yan talaga ang doctor lang ang makakasabi for sure. A few of my mum friends din nakaranas ng weird bumps and lumps during pregnancy na turned out to be nothing, pero kailangan pa rin validated ng doctor.
Don't stress yourself, but don't wait either, book na with your OB this week, ha? They'll check you properly and you'll feel so much better knowing. Ingat!