Sickness and work

I am 6 weeks and 6 days pregnant (1st pregnancy) and have just rang in for the first time to cancel work today as I have been up all night with nausea and vomiting 😩🤢 I feel so guilty for calling in but I knew I would not be able to handle my work day as I'm still being sick now this morning (I work with very challenging special needs children)... is anyone else suffering with severe sickness this early??