No they all got the same chance.. If your energy level is low, then yeah it's going to be harderOh yeah, Karen seems to be a pain to knock up. I support the game on patreon so played the newest release and did a fresh start, took about 80 attempts (i did the see Impregnation Results > Fail > Hit back button Twice > Repeat) but with Remu it took 2 tries...
CorpoLife_dev is it intended for Karen to be harder? I even had max energy, no stress during these 80 tries, if it is a bug could just implement a "High fertility cheat" until resolved