Army TTC restless!

My fiancé is in the army and due to go to the faulklands the 30th of April so we only really have one chance left to get pregnant which is going to be a tight window as it is due to the time he is home before he leaves. When he's home we are at it all the time luckily so that should help. Hard enough him going away without not being able to TTC either! Anybody else have a similar relationship? New to this but thought there might be someone else here with advice.