Questions on symptoms of pregnancy post IUI?

I had my 1st IUI on May 6th. I had a hormone injection the day before and I was on clomid day 3 thru 7. Every cycle on clomid I have had very tender breasts. It is 10 dpo and I have not had tender breasts at all. I had light cramping the day after the IUI and I have been bloated and very gassy since day 7. I am gassy and bloated one day after I get my period but never like this. Could these be pregnancy symptoms or is it all in my head. I have been trying not to psych myself out but it is very difficult. I also took a pregnancy test this morning and it was negative but i think it might be to early to tell if I am or not. I read somewhere that the egg only implants 7 to 10 days after ovulation. Anything will help.