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Ran network on DMZplus mode (no firewall) for a day, am I at any risk?

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arda4

New Around Here
Yesterday I setup my ATT router/modem on DMZplus mode so I could use my Asus AC68U's router function instead of the built in wireless in the modem.

I hooked up the Asus WAN port to the ATT modem LAN port, and where I made a mistake is setting the Asus as AP mode instead of wireless router mode.

From the Asus page about access point mode:
In this mode, the firewall, IP sharing, and NAT functions are disabled by default.

Here is the description for DMZplus mode from the ATT modem.
The DMZplus-enabled computer is less secure because all unassigned firewall ports are opened for that computer

So as I understand, I pretty much opened up my network without a firewall. Is there a way to check if any of my devices or data connected to the network have been compromised? Or is this one day mistake nothing to worry about unless someone was specifically targeting me?
 

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