How to deal with jealousy?

Hi everyone! I’m struggling so bad right now with patience and jealousy! I know I will conceive on Gods time but my sister in law just announced she’s pregnant for the second time and we have to go on vacation with them for a week.... no one but close friends know we are trying so they have no idea how much it hurts when they make comments but honestly I don’t think she’s cares they hurt anyways! I definitely need prayers! I’ve given it to God but letting go is hard for me. Trying to figure out how to look happy for them when inside I’m crushed!