There is a slight correlation between morning sickness and girls but it’s hard to say since every pregnancy is of course unique. My first pregnancy (boy), I had nausea from about weeks 6-13. This time around it’s similar (currently 8/9ish weeks) but I’ve also vomited twice and had one episode of acid reflux. My partner would be thrilled if that meant girl! https://pubmed.ncbi.nlm.nih.gov/33098451/
Have never been more nauseous in life-- second pregnancy.
Im in the opposite boat. My my first I hardly had any nausea and this time it's WAY worse. My first was a girl so Im thinking maybe this is a boy. I asked chat gpt and it said it's common to have more symptoms during the second.