Nescafe Coffee Original Can

Hi ladies, I've been drinking nescafe original ice coffee for almost 10yrs every morn. Sometimes 2-3 cans per day. Since knowing abt pregnancy, I try stopping but m getting headaches, sleepy n moody. M gng to 2nd trimester soon. Is it OK to have 1 can per day? Doc mentioned 1 cup is OK. Is 1 cup = 1 can? Since stopping, increased intake in sugary drinks which beats the point. How do u ladies stop drinking coffee???