Hey mama, sa 24 weeks medyo unusual na talaga pero possible pa rin, usually by that time ang morning sickness ay natapos na, pero every pregnancy is different talaga! A few of us mums experienced nausea ulit in the second or third trimester, kaya hindi ka nag-iisa, pero alam ko nakaka-alala yan. I'd suggest checking with your OB para sigurado lang, could be something simple like reflux or diet, o baka kailangan lang i-adjust ang prenatal vitamins mo, so better safe than sorry bes!