Period

Hi guys! Wondering if anyone can help me. I have been on the depo for 9 months before i came off it as we are starting our family! I should of been covered till 25th January 2018 - Me and my partner had sex on 14th Feb, for about the last week or so I have been one moooooody cow!! A few days ago (27th feb) I had gone to the toilet and what I thought was the start of my period.. since then I’ve had nothing but still getting slight period pains.. is this due to my body getting back to normal after my depo or could I potentially be pregnant? Please help! I thought I had to have a full period before my body was back to normal? Thank you!