It sounds like someone tried to compromise your account but it was detected and reset as a precaution. I'd recommend that you change your password to a more secure one (ideally a mix of upper and lower case, plus some numbers/symbols).
Also if you suspect your email address to be compromised, then I'd recommend changing the password on your email account - especially if it was the same password fir both accounts (you'd be surprised how many people use the same password for all of their accounts these days!!) :)
