Umm Kinda Worried 😬

Emily • AD❣️🔒|| EMD 👨‍👩‍👧
My boyfriend and I have been having a lot of unprotected sex lately. He normally pulls out but recently he pulls out and puts it right back in for round 2+. When I first got the Depo, my OB/GYN told me I had to eat pretty healthy and take vitamins that contains Calcium, and Vitamin D. I haven't really been following what she says. I've also realized that I've been having a lot of yellow, milky, odorless discharge. 
1. Can this effect the effectiveness of the Depo?
2. Is possible for me to get pregnant? 
3. Is the discharge normal?