A connection with a deity can absolutely happen without genetic ties! Deities can reach out to us through many means and the bond can form gradually or suddenly- when it comes to gods and goddesses, they do as they wish! 
I don’t have strong ties with Brigid, but from what you described, it seems like your dreams about pregnancy and life/death within the home could absolutely all be ties to Brigid, goddess of women, childbirth, and the home. And from what Megan wrote above, your love of fire could also signal a connection with Brigid!
It sounds to me like your instincts are pointing you to your deity, Walter! I would suggest you continue to learn more about her and deepen your connection with her. Perhaps consider making Brigids Cross or doing her Invocation Prayer.
Congrats on connecting with such a lovely deity! I’m very excited for you 