I had sex on the 9&10 of may then got a period the 12 it ended the 16th then had sex the 17th & 18

Could I get pregnant?? the period I had on the 12th was dark brownish red and was very light I also was on the depo shot for 6 months I missed a shot in march

If you're not keeping up with your shots -- or using a back-up method like condoms -- and having unprotected sex, assume you're trying to get pregnant on purpose.

You can chat/text/call a women's health professional for free at plannedparenthoodchat.org.

Here's some info to help you figure out if your boyfriend's sperm hit the target:
http://www.plannedparenthood.org/all-access/am-i-pregnant-34501.htm

You can learn more about birth control here:
http://www.plannedparenthood.org/all-access/my-method-26542.htm

And more about pregnancy here:
http://www.plannedparenthood.org/info-for-teens/pregnancy/am-pregnant-33831.asp#