Early Ovulation??? Please help! Thanks

I had very stretchy CM 2 days after having sex it was very stretchy and watery. On the day we had sex I had sharp ovulation like cramps. I wasn't suppose to start my fertile window until 3 days after having sex. 5 days after sex i had CM that was kind of cloudy but when rubbed between my fingers it got creamy. I think I may have ovulated early but 6 days later after having sex I have been very sick to my stomach, continues headaches and light cramping for several days now.. Could I have ovulated early??