Just found out sister in law is prego

She just got married a few weeks ago, and she is announcing pregnancy already. I had a miscarriage around Christmas time and we keep trying now... I am jealous. Literally. She never liked me and I feel like she just called my husband to rub it in (we've been married for 3 years). Is it ok that I feel this way?( also if I get pregnant this month I don't want our kids to be that code in age... I just feel bad(