I have a question for other moms I had my 2nd baby in November before I left the hospital I got the…

I have a question for other moms I had my 2nd baby in November before I left the hospital I got the depo shot...I didn't have sex again until 8 weeks after It has now been almost 11 weeks after having her...is there a possibility I can be pregnant again..I'm sensitive to smells and when I eat it makes me nauseous and when my daughter breastfeeds it hurts and I'm extremely tired.. help please should I take a test now or wait for a missed period?