June 11 had sex with ex, June 15 got period, June 25-29 had sex with boyfriend of 9 yrs, I'm pregnant now who is the father>

More then likely your boyfriend is... you got your period AFTER you had sex with your ex... when you go to the doctor they will tell you how far along you are... pregnancy with the ex will mean that they will go by your lmp before you had sex with him... pregnancy from your boyfriend means that they will go by your lmp of June 15... if you are still unsure then have a paternity test done

Thanks, doesn't sperm only live for 3-5 days anyway?

Yes sperm can live around 3-5 days

Have a paternity test done - that's the only way to know.

That's the only legal answer and it will save a lot of problems down the road.