I only took the depo once back in August of 10. I didn't get my period at all during the time of that one. I missed my next shot at the beginning of November and I haven't had a period since the one I had in August its now January 17, 2011. I used to be pretty regular it came and went on time. Me and my boyfriend use protection and I've taken three pregnancy test all negative. I'm not sure if this is normal or..

It can be, as the depo injection can really wreak havoc on a woman's menstrual cycle. It may take several months still before your periods resume, they may start back up next month.

Certainly continue to use protection if you want to lower the chances of pregnancy. Some women in the same situation will take a pregnancy test every month until their periods resume just to be sure. For the peace of mind, you could always see your doctor about it as well.

Thank you very much this was really helpful :)

I miss my depo shot July 12 no period it's now October 11.2011 and me and my husband have under protection every time

I missed my depo injection beging of September 2013 and I still haven't had a period nov 13.
I had unprotected sex a few weeks back and I'm now suffering from sore breast
Is it possible I could be pregnant

It is possible. Whenever you have sex it is possible. Whether it is likely or not is another matter all together.

The depo will probably be still in your system so the chances should be lower, but not gone completely. Since you probably didn't have a period while on depo chances are your womb isn't really ready for an embryo, but it could be. There is no real way to know. IF you don't get your period soon, try a home pregnancy test.

As well the sore breasts could be a side effect of coming off the depo. The most noticeable symptom of pregnancy is no period until the late second, early third month.

Unfortunately it is a waiting game for a little longer.