Period, no period, not pregnant ebf?

Alesha

I went off birth control about 2 months ago, got a 5 day period, and had sex 2x 2 saturdays ago. I was supposed to start my period this last Tuesday, so i am approaching a week late, but took a test and it was negative. I am still ebf but he gets other meals now too. Is it possible to have one period than horomones change and i not have one for an extended time?