Recaptcha installed but still getting spam

Hey folks,

I've had a site for about a year and never gotten spam.  A couple weeks ago, I began getting many spam messages per day through my site's forms.

I'm using 7.1 so I went in and toggled recaptcha "on" on each of my site's forms.  SQSP verified they are working, but I am still receiving multiple spam messages each day.  

I created a filter in my email to automatically archive any of these messages, but I fear I might accidentally miss non-spam messages from actual site users.

Anyone have suggestions on how to cut down the amount of spam I'm getting?  Thanks in advance!