WORRIED

I stopped taking depo for about 5 months now for about 5 years, then switched to pills for just couple of months, then stopped. I`ve been having this problem, right after I stopped taking my pills I started bleeding for only 5 days then missed for a month and a half and now I`m in this devastated moment that started on Oct. 19, I`ve been bleeding for almost 2 months now, I`ve no idea iF depo has something to do with it or what not. PLS. I NEED AN ADVISE. Dizziness and nausea been my side effect but could I be possibly pregnant? b/c I had numeruous "activities" with my one and only partner since I stopped taking my birth-control pills. Thank You!