Mommy dropped the ball

I've noticed that over the past 4 days or so LilyBug hasn't pooped.  Maybe a pea sized amount but that is it.  I thought that maybe she was constipated, but I wasn't sure.  I didn't see her struggling to poop, so I just gave her time.  What I had noticed is she would cry really hard (I would be out of the room & she's sitting in her crib) for a minute  & I would come back in the room to see this strained look on her face.  I'd pick her up & she's stop crying.  I didn't think much of it.  I just thought she wanted to be picked up.  The strained look should have been enough for it to click in my head that YES SHE IS CONSTIPATED!!!  But nope, my light bulb didn't go off.  Well yesterday when I picked her up from daycare, the lady that watches her said, "Tenika, I think LilyBug is constipated.  She is straining/crying/getting on all fours."  I was like OMG, I feel so bad.  I thought she might have been, but hadn't seen any signs.  Then my light bulb went off..DUH MOM, SHE'S BEEN CRYING/STRAINING FOR A FEW DAYS!!!  So last night I stopped at CVS & got some Gerber Apple juice.  I mixed the apple juice w/water & tried giving it to her.  I should have known she wouldn't like it because she doesn't like applesauce.  She took a few sips, but that was about it.  I'm guessing those few sips worked though.  During the night she pooped once.  After I got her dressed for daycare this morning she pooped again.  AND on the way to daycare she pooped a 3rd time.  I feel totally terrible.  How could I not notice that she was constipated & in pain?  I'm trying not to be hard on myself, but the signs were there & it all went right over my head.  I need to slow down & pay more attention.  Poor thing, I know she must be thinking her mommy is not too bright....