Frustrated

I have pcos very bad. The dr has put me on medication for it and a very strict diet. Yes I have lost over 30 pounds in about 4 months and I am happy about it I just feel I'm still not good enough. Idk what else to do. I take pregnancy test a lot and all come back negative. The biggest thing I would like in my life is to start a family. My bf and I talk about it all the time and use zero precautions against pregnancy. The dr told me to be careful because the combination of medication can make me become pregnant fast but I have been taking them off about 4 months and nothing. I have tried every position. I have held my legs in the air. I have done everything I can think of. Any suggestive??? I'm 26 and I know that's not super old but it's plenty old enough for me to start a family.