4wheeler while pregnant.

Please no judgement just looking to see if anyone else has done this! We have a tiny 4wheeler I think it’s a 90. My almost two year old loves to go for rides around the yard (we have a huge yard) we go slow no big bumps or anything and I’m not worried about me or him falling off. Is this okay to do while pregnant? The vibrations? Husband is always working otherwise I’d have him take him for rides! Always super careful just don’t know if this can negatively impact baby! 28 wks tomorrow!