Hugs to you all! How rude. I dont think it matters what gender/nationality/religion/age any parent is. Aslong as that child is loved, nurtured, in a loving home and has a healthy environment why should it matter that you are both women? I say enjoy your pregnancy, share it with your partner, It is the baby you have BOTH been wanting to concieve, dont let your step mother ruin it for you.
Congrats on the pregnancy, and wishing you a H&H one!!