I'm a guy, and I'm 18, so I can't say I know how you feel, but my mother has had 12 miscarriages to this day, she managed 3 children, and we are all pretty good kids, what I'm saying is, when she had her miscarriages she was torn apart, as any caring woman trying for a family would be, but there is always hope... The fact that you got pregnant the first time is a good sign, it means you and your partner are both fertile, however this does mean it still is up to chance, but if you keep trying I have no doubt that it will happen, fertile couples with no issues can take months with numerous time copulating each month while following ovulation etc. so don't lose heart if it takes a while, it just means that when you finally have your child, you will cherish them that much more. If that makes sense? By the sounds of it you will make a great mother, keep trying, don't lose hope, seek help from a family planning clinic if you wish? They can just help confirm fertility and give some tips etc.
I am with you. I had a misscariage at 17 weeks and 5 days nov 18th. I got my period dec 30-5 and I was 12 days late for my second period feb 12. I want a babe so bad. I wish you luck