Messed up, need help

Hey everyone,

I've been replacing linoleum in a bathroom with tile, and I messed up, and I was hoping I could get some advice on the best fix. Basically, I left a gap between the edge of the tile and the porcelain bathtub and the tile shower, and I need to figure out a way to cover it. The instructions I read for tiling said to leave a gap between walls and the floor, and, (stupidly now, I realize) I treated the shower and bathtub the same as the walls (instead of tiling right up to them and caulking the joint). Originally, when there was linoleum there, there was a quarter-round against the tub and bathtub and I figured I'd do the same thing--of course now I realize there's no way to fasten the quarter-round (they nailed it into the floor).

I could, of course, chisel out the last row of tile, re-cut and replace it all, but I'd much rather not because (a) its a pain, and (b) I'm entering my third trimester and getting a bit unwieldy, and I think that job's a bit more physical than I'm up to at this point (and I'd really like to get it done before the baby arrives). Ideally, I'd really like to find a way to attach the quarter round instead. I was thinking there might be a way to screw it in through the tile, or possibly a glue that would hold it well enough? Any advice would be great. Pics of the problem are attached.

Thanks!