My pregnancy does not belong to my husband

Hello Dr. Mama Zimbi, my name is Emelia and I have been married to my husband for 6years now. We do not have any child because when we first married he said that he was not ready yet. So we use protection when I am not safe. But he has impregnated another lady beside me. He doesn’t mind me and has refused to have sex with me 2months now because I complained about his performance in bed and that I need a baby. 3 weeks ago, my former boyfriend who is also married invited me to a hotel and forced me and had sex with me. I just go to know within this week that I am pregnant to I drug my husband last night and he slept with me without protection. I am decided to wait for 2 weeks to tell him that he has impregnated me. But I am feeling so bad and ashamed. Please advise me as to what to do.