i've been on the implant for 2 years and a few months. it's due for a change august/septemember.

my periods totally stopped when i got it put in. not had one since.

So i started burning up and getting these pains in my abdomen and back and was becoming worse and worse so i went to the toilet and realised i was soaked in blood. it was clotted and thick not like any period i had ever had i tried not to look and just cleaned myself up. 
I freaked out and called a friend as i didn't want to go to hospital, she came over and brought cocodamol to numb down the pain. but it didn't work and just ended up making me drowsy i couldn't lie on my back or stomach it was so sore so she had to plump pillows all around me. the pain was coming and going and sometimes sorer. 
i tried not to sleep til the bleeding lighting up a bit but i felt completely drained had to sleep. 
the next day showered when i work up and the bleeding was extremely light compared to before hand. 
i was still in pain but not as bad. i could barely move my body from feeling so exhausted and heavy the next few days. 
only two of my friends know what happened neither of them have ever been pregnant or experienced a miscarriage but feel this may have happened to me.

i've been ruling it out cause of having the implanon. but reading a few things online i am over weight for my height and my implant is pretty hard to find as i've noticed its moved.

Some advice would be appreciated, thank you.