Lice shampoo in mouth

My niece had apparently had lice when she stayed and I wasn’t told until today so I got some lice shampoo and while i was rinsing some of it got in my mouth but I don’t think I swallowed any of it . I rinsed my mouth out but I can still taste it and I’m crying because I’m scared I killed my unborn child . I have extreme anxiety and my fiancée is yelling at me for being upset saying I’m over reacting. I don’t want to go to the ER for something like that plus I have no insurance. I’m just freaking out . Am I over reacting ? This is what I used