Re: UGH-What is going on ?
Illness can DEFINITELY throw off your cycle. Even though you didn't take any antibiotics, just being sick can mess with you.
Just a side note: antibiotics don't really stop your period. So you could have definitely taken antibiotics and still gotten your period. It only makes it ineffective as far as birth control. You can still take antibiotics, and if you were sick it would have been a good idea to do so to get over the sickness. Just use condoms while on meds, and for a few days after.