How long until depo is out of my system?!

Jade • Ftm to Isla - Rose 5/9/15 💗

I didn't go bk for my next injection in January, i had 2 injections. My periods have finally returned regular again but every time I take an ovulation test... they're always negative :( it's been nearly 10 months of ttc and the waiting sucks! How long should I wait before going to the doctors for advise/help? Any advice or opinions?

Thanks ladies x