Feeling down and resentful towards husband.. going to work soon (part time). Need somewhere to rant

Husband earns a lot more but still expects me to contribute proportionately e.g I contribute 1k and he contributes 4k. We are still paying mortgage half half. I just feel resentful because I know people or friends where husband will just pay for everything.. but we have joint acc so we just use from there. Trying not to be calculative since we are saving for a house where he’ll paying more since he has more savings but just can’t help it… Also feeling more down everyday.. can post natal blues be so late? About 3 months plus already