We Had Sex On Ovulation Day, A Shallow Penetration. I

We had sex on ovulation day, a shallow penetration. I took i-pill the next day within 24 hours.I started to feel nausea, minor cramps,headache and vomiting tendency.I had to travel a long distance after 2 days and I experienced very heavy cramps that I fell to the floor.On the 15th day after sex I spotted a brown fluid for some time, then started to bleed lightly in pink.Its not like menstrual bleeding.My next period is due in 4 days. I wonder whether it was an abortion or not? Whether I was pregnant?Im desped badly pls anyone help me!