How to reduce broodiness?

Okay basically im 19, 20 in december. I'm getting married in september and i love my girlfriend very much by since i was 15 ive wanted a baby. when i was 15 i misscarried and again when i was 18 i misscarried. I have recently been diagnosed with PCOS (Pollycystic Ovary Syndrome) which can half your chances of have a baby and can make it very difficult to get pregnant. The doctors have mentioned in some cases it may take upto 6 years to fall pregnant so i want to start trying as soon as i've had the all clear from the doctors but my girlfriend thinks we should wait until we have a house of our own as we are living with my girlfriends mother. I just need help to stop being so broody..... It not as easy saying think of the sleepless nights, the dirty nappies, the money side, the pain of child birth to be honest all that stuff just makes me want a baby more! any helpful adivce would be great =D thank you