Please Help!

I had my period on dec 2. My cycle 32 days. So it makes my ovulation window 15 to 20. I had protectedsex on dec 8th. During the 15 to 20th days I had severe fever and took too much tablets ( drugs) and i didnt notice ovulation. After the fever which is after 20days i noticed ovulation mucus from 22 to 29th. I thought my cycle changed... it is 9 days delay now. I took a test negative. im pretty sure. My cycle changed... or what should i do now... my cycle usually changed from 1st week of the month to 2nd week yet im concerned.