Help ladies?!

So im due to get another depo shot in 2 weeks time, Im not going to get it as we want to TTC. Ive only had the depo twice in a row and as this one is wearing off just wondering if its possible to wear off sooner?

Ive actually been taking pre conception vitamins for a few weeks now but the strange this is the WHOLE time ive had the depo shot not once have i had any normal looking CM. Most of the time ive had my period as usual or its brown discharge. My last period was back on the 17-23rd and i tracked it as a normal period and the calendar is now telling me im fertile this week and ovulating today and i just think its totally bizarre that ive woken up and gone to the toilet and to my surprise it certainly looks like im ovulating (ive tracked CM in the past and thats how I got pregnant with my last bub, so i know exactly what im looking for).

Could it be possible that im ovulating even though the Depo is still in my system? Im really confused.. i would love for it to be wearing off sonner than expected as im hoping in the first 1-2months we will get pregnant.