When will I reach my breaking point?

A little back story, my now husband and I met when I was 19 and he was 18. We had only been dating for about 6 months when I found out I was pregnant. We had a very loving relationship and were very happy. We got married when our daughter was 3 months old even though our relationship wasn't solid at the time. Now we continue to argue constantly. Every day we bicker about something, I feel extremely unappreciated as a stay at home mom, unloved, and I feel that he doesn't take his role as a father as seriously because he works full time. I'm just wonder how some women knew whether it was worth it to keep trying or when it was time that you'd have enough. I'm really struggling right now, and don't know if I could even be a single mother, but it's obvious that neither of us are happy. Any advice/stories/tips are welcome.