low fetal dna ???

just an explanation i am 5’3 199 lbs. i got NIPT test done at quest diagnostics when i was 13+5.. i’m now 15 weeks. could it have come back invalid due to my weight ? she didn’t say why exactly just said it could be numerous issues. my 13 weeks ultrasound looked good so i don’t want to get worried about the baby not being okay. i really wanted to know the gender asap but i’ll have to wait until i can get it done and i hope the results come this time… has this happened to anyone else ??