She's pregnant without trying!! 😠😠

My sister in law called this evening. she found out she is pregnant. my husband and I have been trying for 6 months as of today. She and I do not get along but do act respectable. i am so hurt by the fact shes not even trying and bam. she always has to one up me. we did everything right we dated for 5+ years got married fixed our financial issues and started trying for a baby. just when we were due for a win something else brings me down again..im trying so hard not to be petty but im just so hurt..and broken and i want be happy for her but it was our turn for baby.....