Pregnancy sadness

Hey, I am currently 12 weeks pregnant with baby number 2 and my best friend has recently found out that she needs fertility treatment as she is struggling to conceive baby number 2. I just can’t help this feeling of guilt that I am pregnant and I’m sad all the time. I keep crying at anything and I’m worried sick that this is going to impact our friendship. We have been friends for over 20years and are really close. I feel like I can’t get excited and I really don’t want to hurt her feelings and haven’t announced on social media. My 20 week scan date came through for her birthday and I have changed the date as I don’t want to be insensitive. Just looking for some support really and anything else got this?