AF question and sick!!

Monica • I`m a 25 year old military wife and mother to our 5 year old son, Rylan and our sweet Maci born 7-17-15.
So first question is when does you AF end? Is it once no more bleeding or only spotting? I ask because I haven't bled all day except a few spots here and there so is that considered me still on my period or should I put that it ended? sorry I'm just confused lol.
​Second question, I am sick, I have strep throat (boo!!) and I have to take amoxicillin meds. Will this mess up my Ovulation  or my chances of concieving this month? Thanks :)