wow - I'd have somewhat understood her being upset had she experinced a m/c, but would be in shock if it was just because they'd been trying for 4 months with no success. Some people I know have been trying for well over 5 years with no success and they were absolutely thrilled when we announced after 2 years and 4 m/c that we'd managed to conceive the 2nd time around.

I think you really need to let everyone know how hurt you feel and that they've basically killed the excitement behind your good news, otherwise you're going to feel crappy throughout your whole pregnancy whenever you're around them.

Congrats and good luck!