How would you feel?

After ttc for 4 years with my husband we finally got our BFP in February, I'm now 14 weeks 5 days pregnant and was feeling very very excited. But now we come to find out my MIL is pregnant, 6 weeks and a few days. WEIRD. She hasn't wanted kids since she had her last 15 years ago. I'm of course happy for them, I guess. But I'm also very annoyed that she basically didn't let us enjoy being the 'spotlight' that long. My husband told me he's upset that his parents decided to do that now and not before or after I gave birth. How would you ladies feel about something like this after being ttc for so long??

UPDATE: she does admit to it being a planned pregnancy so our baby can 'have someone to play with'. I'm in no way saying I'm mad or jealous she got pregnant so quick and I didn't, I'm saying she didn't have to do it right after we announced our pregnancy. Not once did she mention when we were ttc she wanted more kids, she even said she was getting the shot and would constantly say she couldn't deal with having another one after 15 years.