1 month after surgery, still no period!!

Last time I got my period was January 17th. I got surgery (Laparoscopic Cholecystectomy) on January 27th. I had unprotected sex when I ended my period. According to my calendar and cycle I was supposed to get my period on February 14th. I waited a week to test and both test came out negative. Well, it's March 2nd already and still no period. The week I was supposed to get my period I was feeling crampy. I've been moody these past weeks and I'm coming down with a cold.

Idk if the surgery cause my cycle to mess up.

I have a doctors appointment on Monday to get blood test done to find out if I am or not.