Hiccups are very strange things, I mean, that they can spontaneously appear and the same disappear. But there are such situations, when the hiccups don't stop without any tricks. My wife, when she was pregnant, began to hiccup and couldn't stop. Likely for her, I found some good ways of stopping the hiccups in the article "hiccups while pregnant"(
https://www.drprix.com/hiccups-while-pregnant.html ), also there is a lot of interesting information for the pregnant women. Hope the ways from there will help you to stop your hiccups.
