Long shot that im preg?

im going through alot atm an i am dealing with it all by my self... im a single mum of 2 going through a separation from a dv situation, my family and friends live across the county (Australia) an im stuck here by my self because of aws that keep the kids in the same state as their dad. since being told i cant go home with my babies this has been happening:

i grind my teeth without realizing it an my jaw always hurts now. i also get chest pains... i am always tired an when i sleep a good 8ish hours i wake up an still feel really tired, like i haven't slept. i am always bout to snap... i feel down all the time, an worthless. i have no motivation... i also am always bloated an have had a bad upset tummy resulting in on average 9-11 poops a day, they arnt lose, just the norm (i think) i am always hungry but i eat then get bloated real fast then about half a hour later im starving again, its a endless circle. i also have a sore sore upper back.
i also have sever pains in my lower abdomen on both sides just above my hips for the last week.... but im on the implant i have been since aug last year, i have read how people get preg while on it. i hope to god that im not one of them, coz the dad could be a number of men.... when i left the x i went a bit crazy with them, an even with my x.. he was the last one. the one before that was bout 1 mnth ago, an his vanished from time an space, he made me believe he wanted something more then got in my pants n the vanished.

some advice please