21 weeks!

So, Oct 27, yesterday, we had our ultrasound.  I was supposed to be 19 wks 4 days but the ultrasound said i was 21 weeks-YAY!  (skipping 2 weeks is good!)  Dad found out what the sex is and told big sister, Aunt Lan and grandma!  I decided not to find out but I think it's a boy!  The scary part was that they told me my cervix is short.  Went to the doctor today and he said he would show the ultrasound to Dr. Wong, the perinatologist.  They will let me know if I need to get a cerclage or if we are just gonna monitor it.  Either way, I will probably be having u/s every week to two weeks.  I'm not worrying, though, things will all be okay!