Strong kick feeling???

Tracy
Hi ladies I am 17w 4d pregnant with my second, my first pregnancy I didn't know I was pregnant until I was about 18weeks so this time I'm so anxious! BUT for the past 2 weeks whenever I have a big yawn or stretch I fill this like really hard kick that scares the shit outta me in the middle of my stomach closer to the top. I know it's not the baby cuz she's still to small to kick that hard. It feels like an 8 months pregnant kick. I have an appt next Thursday so I will mention it to doc, but I was just wondering if any one else had experienced this