Am i in denial or is he CRAZY ?

well , ive been clean of pregnancy almost two years now . i had a baby in 2018 and he is now almost 2 😌 ive been on the depo shot since about November of 2019 . well for some women , you wont get a period . but me , ill get one every now and again . and it will clot as a normal pregnancy. well my last period, which was last week only lasted 2 days versus its normal 8 day length. ive been extremely tired , and i didnt clot this time . my lower back has been mildly aching and im nauseous throught the day . my sons father thinks im pregnant again and wants to buy a pregnancy test . could i be pregnant or is he crazy ? whenever i get my shots they never give me pregnancy tests they just administer my shot 🤷🏽‍♀️ i kinda DONT want another child right now tho .