i am a rh negitive mother

i am a rh - mother i didn't know what rhogam mean i once and i have a misscarri afther it was 5month i donnot kown how i lost the baby the docter told me that have to buy the rhogam and have get it witheing 72 houre but when i get it ,it was too late do am pre now 1month and 2weaks can i still get the rhogam shot