Herbal sleepy time tea in keurig cup ?

I'm 27 weeks and was wondering if I could drink a small cup of this herbal tea before bed? It says sleepy time herbal tea on it nothing else but this is my first time drinking it and I was wondering about it. I believe it has some lemon grass in it to but its just a small glass.. I have never consumed this before and I'm concerned .. Can I finish my cup of tea or is it a no go..