In California the payment for erroneous incarceration is specified as a maximum $100 per day, and that daily rate would be awarded only upon an evidentiary showing of all of the standards for liability for error. This potential award would not likely be sufficient to cover the costs of suit for collecting the allowable amount.
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Possibly, though the damages at 7 days might not be that high. Have a look at this interesting article: http://newsok.com/man-claims-he-was-held-in-oklahoma-jail-for-months-after-his-sentence-expired/article/3756331
Find an aggressive attorney that is willing to take your case. Good luck.