Help!!

Whitney • 29 year old..Wife...Mommy of 1 with 1 on the way.
We have been TTC for 8 months.  I don't take my temperature or check my ovulation. I wanted to start but my husband feels like that is doing too much. With our daughter we were not trying and got pregnant. So he feels like whatever will be will be. Should I just let it go or should I start monitoring everything?