Should We Be Concerned About Any Health Risks To My Pregnant Wife And Baby If She Accidentally Drank A Drop Of Kettle Descaler This Morning?

Good morning , last night I boiled some descale for kettle and we forgot to clean it . My wife har a drin 1 drop this morning when she made her tea. She is 23 weeks pregnant and we are worried about baby health and her health. She doesn t have any simptom at the moment also she drink 1 liter of water