Light brown on hefsek

I had a very light brown – I would call it tan – spot on my hefsek taharah last Friday night, moments before sundown. I couldn't do a Moch Dahuk because we were staying with friends and had to rush out to shul (I usually lay low/lie down if possible until I can take it out but couldn't in this situation). The next day and all following days (so far) have been clean.

The question: Can I go to the mikveh this Friday night?

A few other facts:
– I have only been married for 2.5 months so am still new to checking.
– I did have a light brown stain checked last month and I was told it didn't render me niddah. The stain on the hefsek was the same color.
– I didn't save the hefsek taharah cloth (will next time).
– This probably doesn't matter but I have to leave my husband for two weeks starting Saturday night at midnight and would be so so grateful if I could go to the mikveh on Friday night.

Thank you:

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