My Husband Had A Knee Reolacment On Sept 25 The

My husband had a knee reolacment on sept 25 the first week he had trouble hold his urine and had to pee often then after the first week passed that git better but every morning the first pee of the day a few drop of blood would come out nothing the rest of the day this has been going on evetyday today it happened on the morning and now again in the afternoon. He had a foley in during surgery. Whats going on