Me and my husband have been trying for three months.
I have no std's and my family is known for having lots of children.
He's has a daughter from a previous relationship.
We have done everything in the book.:(

You have ONLY been trying for 3 months.

Most couples take an average of a year to conceive.

Talk to your doctor to make sure you are charting your ovulation correctly--and then make sure to have sex a couple days BEFORE you are expecting to ovulate.

Iwill agree, even those with no issues often have to try hard for a year or more, ** OK, I know those that don't want to, get pregnant even with birth control. ** And yes there is timming that can help, talk to your doctor and/or read some good books on the subject.

A good book that can be helpful is Taking Charge of Your Fertility... by Toni Weschler