Stay at home mom..

Now that I'm 7 weeks my children have no sympathy for me.. lol! I swear now that I'm pregnant they are just pushing me to my limits.. i am just starting to feel very stressed and I know that's not good for the baby. I feel like a bad mom sometimes not having the best patience they deserve. Any advice or comparisons? Try and make me feel like I'm not the only crazy one out there.