Unwanted pregnancy?

My husband and I were actively trying NOT to get pregnant.. When we found out we're expecting again.  We used all the precautions  I was on nexaplanon and we used condoms and if we didn't use condoms we use plan b within 24 hours ALWAYS.  
I'm very early in this pregnancy and am not really wanting to go through with it. 
I just don't know if I can bring myself to terminate this pregnancy.  
My husband has said whatever I decide he supports but I just don't know...