In Jain practice, simply chanting the Navkar Mantra three times and saying “I pledge” is usually not considered a complete pachkhan by itself.

A pachkhan / pratyakhyan generally means:

• a clear vow
• for a specific thing you will avoid or do
• for a specific time period
• taken with full intention and awareness

So if you only say a general “I pledge,” it is more like a sankalp or personal resolve, not a full pachkhan.

If you want it to count as pachkhan, it should be stated clearly, for example:

• what you are giving up
• for how long
• with firm inner commitment

Different Jain traditions may have different forms, but the main principle is the same: a pachkhan must be explicit and intentional.

If you want, I can give you a simple proper pachkhan format in Jain style.