Getting pregnant for the wrong reasons

Vikki • 25, Newly married, added two children to my life ages 12 & 7. Considering my own child next year.
I've been having some "baby mama" drama issues with my husbands sons mother lately. She is married but she was on and off with my husband for 8 years, and has his only son, so she is always throwing little things in my face. She has told me "I've been around for 8 years & am the mother of his son u mean nothing" & it's making me want my own child with him more but Ik I may not be the right time. Have any of you ladies had babies for the wrong reasons or ever been feeling this way, is this normal thought??