Am I pregnant? please help me?

During sex, we used a condom, but it was dark so he might of taken it off. Well so when I went in the bathroom afterwards it started my period, (I was a virgin) only my period was longer and lighter then, it usually is. I smelled strongly of fish, several days afterward. My lower back really hurt. I get morning sickness I never had before, and frequent headaches. I have nausea a lot, and light headedness when I get up from laying down. I also had a lot of bloating. I had cramps in my feet while swimming also. All these signs seem very early since I had intercourse on june 17, and I am posting this on june 28, which is 11 days after sexual intercourse. So am I pregnant?