16wks pregnant. my nausea is still so strong i don't take any medications prefer not to. first pregnancy nausea subsided by this time. is it worrying?

Nausea: Morning sickness in pregnancy usually start to decline by the end of 13weeks. There are some patients in whose their nausea can persist into the second trimester. As long as you can tolerate food and liquid, you can be rest assured. Please ensure that your q. hcg is reasonable level. You can take vitamin b6 daily which can help alleviate nausea.