As Lesley gave u dates, I would say your husband since u had sex with him may 10th and didnt have sex with the other guy until June like u stated. DNA test is the only way to know for sure but I would say ur husband unless ur conception is wrong... Ask ur doc when u conceived and she might b able to give u better accurate dates
Based on an online calculator your estimated conception date was between Thursday, May 13, 2010 and Thursday, May 20, 2010
It all depends on how long your usual cycles are, go onto an ovulation calculatiin site and fill out the info for you and it will give approx ovulation dates etc, then you can work it out
Go by ur conception date do u know what it is?