Hi thanks for your question.
Since you had sex on the first day of fertile period,at this stage it cannot be said your pregnant or not.Implantation
bleeding takes place between 6 and 12 day of ovulation at an average 9 days after ovulation.So if you will concieve from this sexual act,your implantation bleeding would be around 22nd.The vaginal discharge
and pain abdomen could be due to yeast infection of vagina.I would suggest you to wait for your periods,if you miss your next due periods,wait for a week and go for pregnancy
test to confirm or rule out pregnancy.For vaginal dicharge and abdominal pain
consult nearby physician.
Hope this answers your question.