Bottle to Boob

It seems that Laila is starting to prefer getting her milk from bottles instead of my breast. Yesterday she flat out refused my breast a few times, and today she fusses half way through her feeding. I switched her to the other side when she wouldn't latch back on, but she only lasted on the other side for a little while before she started fussing again. It's really starting to upset me. I only want to have to pump while I'm at work, but I'm starting to think that I may not have a choice. Just as I'm starting to really enjoy breastfeeding, Laila is starting to dislike it. This really sucks.