According to the Chinese Gender Chart, if she is conceived in the following periods in 2019, you will get a baby boy：
Jan 6 - Feb 04 (31 lunar years old, 12th lunar month)
Feb 5 - Mar 06 (32 lunar years old, 1st lunar month)
Apr 5 - May 04 (32 lunar years old, 3rd lunar month)
Dec 26 - Dec 31 (32 lunar years old, 12th lunar month)
It may could help you increase the chance of getting baby boy.
Jan 6 - Feb 04 (31 lunar years old, 12th lunar month)
Feb 5 - Mar 06 (32 lunar years old, 1st lunar month)
Apr 5 - May 04 (32 lunar years old, 3rd lunar month)
Dec 26 - Dec 31 (32 lunar years old, 12th lunar month)
It may could help you increase the chance of getting baby boy.