Trying to conceive 3rd baby

I have been trying to conceive a 3rd baby for nearly 2 years. With my first 2 children, it took me 6-7 months to conceive. Had some blood tests which came back normal but my GP will not refer me to gynaecologist as they said they will not even see me as I already have children. I am feeling really down that I cannot get pregnant.

Is my GP right or has anyone else been seen by a gynaecologist when having problems conceiving their 3rd or 4th baby?