please shed some light

it's been just over 4 weeks since I missed my depo shot (june10 I had a light bleed that lasted 4 days and my depo was due 12june which I did not get) and I was pregnancy testing up until last week, but I have not had any period. so as of the last couple days I have been having cramps in my hips and my lower back and my left ovary area. I'm constantly going to the toilet mostly to pee my body wakes me from my naps or during night time as of to say get to the toilet or you will burst and also had loose bowels, do you think I may need to keep taking tests or does it sound like I am due for my period xx