Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
Pain & swelling in thigh must be related to some muscle related injury during sex or it could also be a side effect of an emergency pill like I pill. In second case, it would last for 1-2 days. You could take pain killer like Diclofenac & a
muscle relaxant for this.
The abnormal period or bleeding must be
breakthrough bleeding, which normally occur after intake of an emergency pill. There is nothing much to be concerned about this abnormal bleeding. You might also have your next period delayed.
One should never use emergency pill or I pill as regular method of
contraception. Use condoms or regular
contraceptive pills to prevent pregnancy in future. Frequent intake of emergency contraceptive pills can cause serious problems like
irregular periods, ectopic pregnancy, ovarian hyper-stimulation syndrome & even infertility.
If problem persist,Consult a gynaecologist
Hope this information helps