PCOS & 1 ovary - 5 days late

Rebecca

so I have PCOS and only 1 ovary. I've been on the depo for 6 years and come off over a year ago trying to conceive. I've just got back into a normal cycle of every 30 days 5 days on for the past 4 months. I'm now 5 days late and I've done serial tests which are negative. Could I be pregnant? anyone had anything similar?