Freaking out

Olivia • 19 • coffee lover ☕️ • Jesus adorer •
So today will be my third brown pill and no period yet. This is my fourth month on the pill and last month I started bleeding the very next day after my first brown pill. 
What do I do? I don't want to freak my boyfriend out but I'm starting to get a little worried too. 
I can't be pregnant right now. It is so inconvenient. Not sure if it's stress either. 😕