It's been a month since I got my paragaurd removed

Hi so a month ago I had my iud removed "paragaurd" I had it for a year , I had lots of pain and tons of bleeding which my ob said was normal with this iud . Well she started me on lo loestrin fe I've been on it about a month as well . I've had one cycle and it was heavy but since then I've missed a couple pills and we have had unprotected sex a few times I was supposed to start my period the 14th this month ,but so far nothing I took a clear blue test yesterday it came back negative so has this happened to anyone else ? I did read that I could skip a period due to the missed pills  ( any advice will help )