Puppy Stopped Using Pee Pad?

I have an 8 month old Chihuahua who's been mostly good about going on the pad. I live in an apartment, so she does all her business there when I can't take her out. About two weeks ago she began her first bleed. Nothing seemed to change during the bleed; however, now that the bleeding has stopped she's going a little nuts.

I have a teddy that I sleep with (that a few months ago I began putting in the laundry hamper when I got up, otherwise the poor thing was brutally ravaged several times a day). She's never humped him when I'm right there (she knows I don't like it), but last night she was trying to have a go at him even while I was wrapped around him. I also caught her balling up my sweater to hump yesterday afternoon, which I'm pretty sure is new. I understand the hormone thing, and she will be spayed soon, but I wanted to wait until after her first heat so her hormones would even out.

As for the pee-pad, she's made three messes in the living room and hallway, and peed twice (that I've found - I have laminate) in the living room, and hasn't touched her pad at all today. Of course, she tends to wait until I'm not paying attention to do her business so I can never catch her in the act.

I'm just wondering if this is normal, and/or if there's anything I can do to get her back on the pad. I'm beginning to run out of Nature's Miracle.

By aysia222 from Canada