Irregular periods. Of this medication?

Hi... I used to have a period cycle of 28 to 32 days. In some rare cases, it takes to almost 40 days. May be Yearly once. This month I had my period on September 5th. Last Sunday I have got fever with sneezing, temperature and body pain. I started taking levocet at night and Dolo 650 whenever needed ( maximum twice per day). But on Wednesday, Since my fever was not reducing, I went to a General physician and he prescribed Panto D, Zeeday(0-0-1) and Allrite (0-0-1)and I started these medication on Wednesday night. On Thursday evening I noticed spotting from vagina and then the flow increased ( not as much as in my usual period). But I need to wear pads. It's colour is a little bit darker when compared to usual bleeding. It contains some small clots also. My next period is supposed to be around October 6th. So my question is whether this bleeding, because of the side effects of this medication?