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I have done this a few different ways.
The first way is using a score field and the engagement program. I would have a campaign that listens for the email send and then pauses them in the engagement program and resets the special score field to zero. I then have a second campaign that adds a +1 to the special score field. And finally, I have a campaign that unpauses the person when the score field hits the number you want. 13 would be used for every other week.
This is a good option if you want each stream to have a different wait period.
The other option is similar. I would simply have a campaign that listens for the email sent and pauses the person in the stream.I then have a second campaign that waits 13 days from the pause and unpauses the person.
Configure your engagement stream to be scheduled every day at a certain time. The pause and unpause campaigns will handle when the person gets their email.