For those who coupon.. help!

Jessica • Im 29 with 2 boys- 6 & 12. My bf has 2 boys 4 & 5. We have been together almost 2yrs and want to try for a baby of our own to add to the family. I have endometrios, so it has been hard.

I am 18wks. I would like to start getting diapers, wipes.. any coupons to help before baby comes. I have some coupons already, so... do I just go use them if there's a sale?

What if there isn't a sale? Do I not buy any then?

Sorry... I'm not used to this, but would love to get into it, especially with 5 boys. Thanks for any advice!!