I wouldn't go straight to a lice treatment.
If you're not sure, I would (every day for the next week put a heavy conditioner on hair after washing and run a lice comb through it thoroughly starting at roots. No chemicals for you and good protection "just in case".
Also the pharmacist said to buy a shower cap and heavy cheap hair gel. Put it on your hair before bed every night for a week (all night is good). I never did that. I don't think I would've been able to stand the feeling.
These might not work good for heavy infestations, of course, but as a preventative/protective measure they're great...also great for small children that you don't want to/can't use chemicals on.
That's just what I would do and actually have done in this situation when I feared.
KD