Durex utopia female arousal gel while pregnant?

I am 5 months pregnant, and I bought the durex utopia female arousal gel. I didnt read the warnings. I really didn't think it could effect me. I feel stupid for not checking but after I did it said do not use if u are pregnant or breastfeeding.. I was wondering why? If I only used it externally *** and if it did not go internally sorry t.m.I. Then would it be a problem still? If so why shouldn't I? Could it harm my baby somehow?