I don’t think you are being unreasonable- it’s ok to have whatever feelings you have about this situation. Although it’s likely your friend has tried to be kind and not want to upset you.
I recently had a similar situation with roles reversed. I had been trying to conceive for over 2 years, and had told my best friend about pretty much everything, because she seemed interested and asked. I finally got pregnant which I told my best friend about immediately on getting the positive test. At the time she had the implant so wasn’t trying to conceive. She was really happy for me. A few weeks later I miscarried and it turned out to be ectopic. She was really kind to me.
Around 2 months later, best friend got her implant taken out. I joked that she would probably ovulate and conceive straight away, and let her know that was ok, I would be happy for her and she could tell me if that happened.
Around 6 weeks later I got pregnant and told her straight away again.
Then, a few weeks later she sent me a text message explaining she had been pregnant and was currently having a miscarriage (at around 6 weeks pregnant). The way the message was worded, I could tell it had been sent to her closest friends and not just to me. I was a bit taken aback that she hadn’t told me about the pregnancy, and also when we spoke and she told me she had been bleeding on and off and in pain for the last few days, and had been to the EPU, I was obviously sad for her but also didn’t really understand why she hadn’t got in touch for some support. I really valued her support when I was trying to conceive and miscarried and I didn’t understand why she didn’t want that support from me. She also didn’t contact any of her other close friends, she just discussed with her partner.
For me it highlighted that people make different choices about what they disclose to who. Afterwards, we briefly discussed it and I asked whether she would prefer me to not ask about TTC/pregnancy related things, because if she would prefer not to discuss it then I wouldn’t ask. She said she wasn’t sure and would ask her partner and never got back to me.
I find it all quite strange and now I am 18 weeks pregnant and it has changed what I talk to her about- I don’t bring up the pregnancy unless she asks and I also don’t ask her about TTC.