Work and pregnancy

Hi all! I just need someone to talk to, and to vent. A little about myself and my life. I am married to a wonderful guy who is currently in the reserves and is gone one weekend a months and 3 weeks in the summer usually. Well this happens to be his weekend gone... I was promoted to a supervisor position in February and got pregnant in March, currently 13+2 weeks. Well I have been working 50-60+ hours a week for the last few months and I'm salaried and not compensated well. Well I have constant call offs and I'm the only one that can cover. Well this last week I've put in about 55-60 hours and now today I need to work an 11 hour shift till 1am and need to go in tomorrow at 12pm... I'm afraid all these hours and stress are going to harm my baby. The last time I saw the little bean was at 9 weeks, I don't have my next appointment till next Thursday and I'm worried. I have no one right now, I don't want to call my mom and worry her, and like I said my husband is gone this weekend. I am thinking of quitting my job because I can't take this stress but that is stressing me out because I'm not sure how my husband and myself would make it without my income. I just dont know what to do, I'm sitting at home crying and pissed off at the world and every little thing is driving me mad and angering me, such as my dog who is just being a dog. I don't know what to do, sorry for the long post, I just an on my last string and am about to blow. Any advice would be greatly appreciated, thank you!!!!