If you just have instant coffee then it's not as bad as strong, brewed coffee or espresso etc. With my last pg I craved coffee - I was drinking a dare espresso iced coffee every day and having 1-2 cups of instant coffee a day. I only like weak coffee though - I was after the taste of it more than anything and most of the time I made decaf at home anyway. I think what you're having would be fine and I would drink it guilt free. my DS had no adverse affects from the coffee I drank during pg either - he was a large, robust baby when he was born and there were no problems with him or anything.