17 months ttc...please read

Co
Alright I'm 17 months ttc me & him have never been checked for fertility yet I'm callin to make an appt soon. Anyhow this month we used opks had sex the right days it's also our first month taking fertilaid (both of us) should I order another month supply and keep taking it because I heard it's usually two months before it starts working or should we go with something else? I noticed I don't have ewcm during ovulation it's just thin watery..make we need to use pre seed or? Can you guys give us advice please on things you used that worked?