I need to vent.

My husband and I have been trying to get pregnant for almost 4 years. In October of 2013 we were estatic to finally get our bfp.  At this time when we were telling my family my sister, whome when she got pregnant was a total accident, thought it would be a good idea to keep going on about how she should try and get pregnant again. Couldn't let me enjoy something that I had wanted for so long. About a week later I miscarried at 5 1/2 weeks. Today my sister called me to tell me she took a hpt and it can't out positive. I know I should be happy for her and I'm just being selfish but she only came off birth control around a month ago. It's just so frusterating and depressing. I'm taking a break this summer from trying and it's hard this time since my husband is leaving for two months.