TTC... What's best?

Toni
Hi all, me and hubby have been TTC for past 3mths. I have 2 daughters from a previous relationship but this would be our 1st together and we are so excited. Not had any luck as yet but BD-ing on all the right days and a little in between ? I'd love some advice on anything we can do, use or take to boost our chances. Thanks in advance?