Please do not take any medicine now.
Thanks for posting your query.
Unless you missed your period there is no reason to suspect that you are pregnant. Since diagnosis of pregnancy
cannot be done unless missed period.
You had act in mid cycle when chances of pregnancy could be there; but still there are many factors play a role in pregnancy. The best thing is to wait till you miss your period. Wait at least for 4-5 days from now. Please do not take any medicines now. The symptoms may not be due to pregnancy.
If you skip your due dates, go for pregnancy test and then take call what to do.