Why am I experiencing worsened periods and insomnia post-surgery?

Yes but only if it's detected early but a close monitor is necessary. But talk to your doctor whether your overall health condition permits it or not

Don’t take more tablets tomorrow unless your doctor tells you to . Severe bleeding can result from taking more tablets. Ensure that you rest and take plenty of fluids. If you have heavy bleeding, severe pain, or any other worrying signs, seek medical help immediately. 

The problem of cervical cancer is caused when the cells in the cervix get as a matter of fact, out of hand. The primary connection is through the HPV virus, which is transmitted during sexual activities. Some non-specific symptoms may also be there including the following: bleeding from the unusual site the woman has never experienced before, pain during sex, and pelvic pain. The use of Pap smears and HPV vaccines is one of the ways to minimize the risk of cervical cancer. This may happen to the p. by surgery, radiation, or chemotherapy. 

If a girl has sex before her expected period and then it comes on, she is likely not pregnant. However, some women may have light bleeding or spotting in the early weeks of pregnancy which can be mistaken for a period. If your girlfriend’s cycle was normal with the usual flow for 3-5 days then she is probably okay. Periods are sometimes irregular due to stress among other things so I wouldn’t worry too much about it unless there are other signs as well. 

Getting late­ periods does not always signal pregnancy, so don't worry. The­ emergency contrace­ptive pill can disrupt your menstrual cycle, causing de­lays. Stress, illness, weight fluctuations - the­se factors impact periods too. If still concerne­d, take a pregnancy test at home­ for reassurance.