Swollen lymph nodes behind the ear?

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I have two swollen lymph nodes that randomly appeared yesterday afternoon behind my left ear. They are tender to the touch.

No other symptoms except extreme fatigue, but I’m also pregnant, so it’s hard to tell if it’s from the pregnancy or an infection.

I’m calling my OB when the office opens, but just thought I’d ask around here... does anyone know what infection these lymph nodes could point to? Thanks.