Fundal Height Question


I'm 35 weeks and 4 days with my second child. I had back-to-back pregnancies (I only took a 2 month break lol my kids will be 11 months apart). At my OBGYN appointment today, they measured my fundal height (aka my baby bump) with the tape measurer and ive been measuring 34 cm (aka that implies I'm only measuring as 34 weeks along) for 2 weeks now. Has my baby reached its birth length/weight or something? My doctor didnt seem concerned but he didnt give any explanation for it either so I'm just curious if that means I might deliver early or something. I'm a bit clueless when it comes to recognizing signs of labor because my first child was induced at 39 weeks 5 days. I never got to experience the natural sensation of going into labor at home or anything, so I don't know what to look out for. Thanks for reading!