16 and confused...

Kayla
I'm going through the worst thing right now, I've been in a stable relationship for almost 3 years ( he's almost 19 ) and I'm 8 days late on my period and I'm never late, I took a test the day my period was meant to be due and It was negative, 2 days later I took another and it was also negative, it's been 6 days since than and AF is still not showing, This morning I started mild cramping but it's not painful I just know it's there but no blood, no spotting either, I don't have no symptoms other than some heartburn and I'm always nauseous... could I still be pregnant? 
Now here comes the worst part, my boyfriend is so convinced I'm pregnant because I'm never late... and he's told me he wants to me to get an abortion if it's 100%... I honestly don't know if I can go through with that, I'm so stuck, o don't want to disrespect his Decision but I can't ignore my wants and needs aswell, he said he just doesn't want to raise a baby that won't have the best childhood like it would if we were older and I understand that but he's not having to physically go through it... I'm in the middle but I'm more leaning to keeping it... idk how he's going to react..
I'm going to the doctors with my friend tomorrow to get a test done there and a blood test... I'm physically scared of the result.... I need advice because I'm so upset  about everything