not sure what to do anymore :(

Star • Getting married march 2014 have 2 beautiful baby`s ttc 3rd. Ttc 17 months
all negatives this month .. on to 2yrs & 9mnths. I have the next 2mnths on metformin then onto clomid. I know there's women in harder situation . but I just want to know if this is possible or not so I can stop this emotional journey . I'm blessed to have 2 children so if its not possible anymore I thank god for what I have and move forward.