Urgent Help Required - Doubts on Visa Conversions

[meenakshi_1948]

Hi I came to US on F2 Visa in 2010. I applied for a change of status from F2 to H1B in April 2011 under 2012 quota. I received my receipt # on june 8th 2011.Mean while my husband's visa status changed to H1B from F1-opt on 27st of June 2011 and which makes my F2 status invalid. As I am already on change of status by then and because of last action rule we didn't apply for H4 status due to the uncertainty on the H1B application decision. I have the following question.
1) Is my stay in US legal as my COS to H1B is under process. If my stay is legal, how many days would it remain legal?

Please advice. Thanks in advance