I dont know if im pregnant?!

Hey guys, so i have a huuuuge concern. My period has been so crazy this year. Ive had 2 periods in a month. Its been so off due that i took the depo shot last year (only did the 1st shot). I started my period 06/26/16 to 07/04/16 then i bled again (5 days later) on the 07/09/16 to 07/13/16. I bled again on the 07/21/16 to 07/27/16. All those dates that i put were like actual periods. BUT this month, August 5th to the 7th i had really really light spotting. It only last for about 2 days. When i would wipe, it would show up in my discharge. Usually when i start spotting it gets heavier like a period. But it didnt. Today is August 16th, 2016 & still NO PERIOD! I dont have cramps, no clues that im getting my period soon. Could it be implantation bleeding? Usually when i start spotting, i start my period light, then heavy, then light again when im about to end my period.

NOTE: Ive been having unprotected sex w/ my husband. He comes inside me all the time.

(Were trying to concieve) 😄

I know my situation is EXTREMELY CONFUSING, but good thing i write everything down on my personal agenda. Or else i would be completely lost lol. Please help.