In Parasha Vayetse, the great Ohr Hachaim hakadosh explains – the reason why Yaakov was upset at Rachel’s pleading to him of “Give me children” lest she die (Bereshit 30:1) was twofold. Firstly She should have said “pray for me to have children”. Her words implied that it was in Yaakov’s hands for her to conceive. Yaakov told her it is only in Hashem’s hands.
He was also upset about her expression Lest she die. a person should never say negative things – “Al tiftach pe le satan” Don’t open the mouth to the Evil force – Lest it come true.
Daven to Hashem and think and talk positively.