Hi,
Thanks for posting in HCM.
Pre-ejaculatory fluid does contain sperms and are capable of causing
pregnancy. But the chances are very less.
But, you have done the right thing by taking morning after pill the next day after the incident.
Hence, you need not be irritable and emotional for having done that as you have taken precaution.
Morning after pill would prevent pregnancy by causing
breakthrough bleeding within 3 weeks from the day of taking the pill.
So, even if you have not got your periods in time, not to be worried until 3 weeks for bleeding to happen.
In case it doesn't happen, you need to seek medical attention without any further delay.
So relax for now and wait until you get your periods.
Hope the information provided would be helpful.
All the best.