Should I feel guilty?

I've been wanting a second baby for a while now ... but we have been putting it off because we moved in with family to buy a house ... my sister in law is now about 20 weeks and she's had previous miscarriages... I had been feeling funny the last few days but my period isn't due for another 5 days ... I got my tests and it came back positive but ... I can't help but I feel guilty ... like if I'm stealing her spotlight... imma wait a few days before anything is said or done .. I feel like being pregnant the same time kind of ruins it for her ... she did see the tests box .. and she doesn't seem different .. maybe its all in my head ... its just we have all been cheering for her and we have all experienced her losses and we are all happy and excited for this long waited baby ... I just can't help but feel weird about it maybe ? Idk ... any advise ?