Is it natural to feel anger and jealousy towards pregnant woman

Hi I know this is probably a stupid question but is it natural to feel anger and jealousy towards pregnant woman. I am 29 and have 2 children age 12 and 9, been with my now oh for 5 years and been ttc for the past 3 years unsuccessfully, I am at stage now where everyone around me seems to be falling pregnant or just having a baby without even trying and it just makes me feel so angry and jealous that I'm avoiding some of my closest friends because I don't want to say something I'll regret and cause offence, I hate feeling like this and don't really have anyone to talk to.