Had a miscommunication issue and ended up receiving 1st Depo-Provera provera (medroxyprogesterone) shot on day 17 of my cycle, is it effective contraceptive or not immediately?

No not effective yet. It should be within 5 days. Taking Depo so late might actually enhance a pregnacy( if you are post-ovulatory).I would use back up for 1st 30 days.

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I got my first depo provera (medroxyprogesterone) shot on the 8th day of my cycle. (I have a 28-29 day cycle) will the depo start working right away? Will it start helping

Use condoms for a wk. The usual recommendation is for a woman to use a second method such as condoms for the 7 days following a Depo-Provera shot, if the shot was given after the first 5 days of her period. Since this shot was given on the 8th day, she can use condoms until about day 15 or day 16. The Depo shot is considered to "right away", but the 8th day is getting closer to ovulation, so use condoms to be safest. Read more...