I think I'm pregnant

I ovulate on 08/19-08/24 I had unprotected sex with my boyfriend on 08/21 6 days after I start feeling cramps like my period was coming..on the 7 day I went to the bathroom and a white mucus with some pink stuff was on the tissue.. It was really stretchy..on day 8 I was having cramp about my pelvic. Day 9 I was nauseated and throwing up.. Today I'm feeling fine just nausea and wondering if I'm pregnant.. My period due to come on 09/06.. Can I be pregnant?