Off depo - blood clots

Depo was out of my system Beg of sep and I have spotted ever since but today I have woken up feeling nauseous & a dull ache in my lower abdomen. Went to the toilet and as normal when I wiped there was blood but this time it was red. There was also a blood clot the size of a 2p.
I have been taking Agnus castus to regulate my periods for 4 days now. 
Any ideas what's going on? Thanks :)