ttc 19 yrs! plz help!

so me and my boyfriend have been trying since the beginning of december.. ik it's super early but i had my iud taken out end of november (i didn't even have it in for the 3 months it takes to regulate) but i've been experiencing mild cramping, bloating, insane fatigue, and the past 2 days i've noticed very mild spotting (1 or 2 drops of blood max.) my nipples are sensitive and tender, and my lower back is aching. i've taken a test but it was negative, but i believe i tested too early. i'm 5dpo, when should i test? is it possible for me to get pregnant this early on?