trigger period?

Angela
Soo I recently gotten off my depo shot in November and I'm waiting to regulate. I didn't have a period December or February. Yet I had like a perfect one January. While I've been waiting to have a period my boyfriend fingered me today. & I noticed when I got home I was bleeding. Like the outside of my panties were SOAKED. But there was like Some sticky blood inside and when I wiped. What are the chances I just started my period after the night was over and not being cut by him or while he was doing his thing? Cause the moment I got home I started having cramps. Mind when I wiped the outside it was bloody like if you were to bleed through. Gosh im hoping it's my period so I can be over with it and start for my next but at the same time I'm hoping it was after we were done because I'm still super shy and would be super embarrassed.