Two vessel umbilical cord

Baby is measuring in the 29th percentile... is this bad? I’m 24 weeks, we have a two vessel umbilical cord and at the last ultrasound growth was 2 days behind the previous ultrasound... I’m overly concerned I think... my OB didn’t seem too concerned. What can I do, if anything to help this baby grow? Is there anything in particular I should be eating? Also fundal height this appointment was a week smaller than I should be, and previously I was measuring two weeks ahead. :(

Help, advice and comfort sought. Thanks all.