I've been on Prontogest IM injections every 3rd day during my pregnancy and have been getting itchier and itchier a couple of days after the injection and Sunday's injection I felt like it turned into a massive reaction and now I can't stop itching. My bum is covered is a hive like reaction and it feels like I have 100 mosquito bites on it. Is there anything over the counter I can use that's safe?