Hi welcome to Health care magic forum, Your description is you had unprotected sex on 3rd and 4th of february, and started taking zifi
-LBX-200 tablets, your doubt is if they have any interaction among them.
Unwanted 72 is a harmone preparation, and zifi LBX 200 is an antibiotic group, As per the knowledge the interactions are not been studied. And as these are of different groups will not have any interactions. So dont worry about the interactions. Worry can delay the effect of unwanted 72, hence there may be failure.
So engaged in some work, till you get the period, so that you can have diversion, from thinking. I also suggest you some diet recommendations as take more of non vegetarian foods, green leafy vegetables and pulses to promote periods.
Dont worry you will be fine and thanks for calling.