Should I retake pregnancy test?

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I haven’t gotten my period yet since I’m exclusively breastfeeding. We’ve been using condoms as a back up but 2 weeks ago we had our first baby free night out and we were a little careless. I tested yesterday just to be safe and the test was definitely negative after 2 minutes. When I looked at it again, at least 5ish hours later, there was a faint line like a positive. Honestly I don’t want to have to make a trip to the store if there is nothing to worry about.

Is it just an evaporation line? Should I go out to buy another test?

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