Are there limits to how nice a non-douchebag has to be to a pregnant woman?

Sitting in a launderette. It's 8pm. The the lights will go off and the door will lock at 9pm (there is an inside door 'unlock' button to stop anyone getting locked in). A very pregnant woman comes in and asks for change from a 20 euro note because the machines won't accept more than 10. I look anxiously over at the dryers. There are only 2. I have 2 washing machines full of clothes on the go. But I think to myself, 'it'll be okay, let's not be selfish now; I'll just take one and she can take the other, and it'll just take a little longer. And next time I'll learn my lesson and won't leave it til 8pm to go to the launderette'. So I search my bag inside and out for change. Not just a quick look. I really do search hard for it. I give it to her and say, as I hand it over, 'But please understand I do need to dry my clothes. I live in an apartment smaller than some caravans and have nowhere to dry my clothes, not even space for a washing line outside.' She (or her niece who is with her, I forget who) says 'Will you have enough for the dryer if you give me your change in exchange for the 20, then? Oh, well it doesn't matter.' But I insist, wanting to help the pregnant woman, and look around my bag some more and find some more change to give her. The woman thanks me profusely and says she completely understands.

She then brings in (seemingly out of nowhere) her 3 hyperactive small kids (aged 3, 5 and 11, apparently). The little ones almost immediately start shrieking. I mean, really shrieking. That ear-piercing shriek that makes you wince in pain. They continue doing it for all of an hour. And she does not utter so much as a 'please don't do that, the girl next to you is trying to read'. No, she just lets them do it. And I sit there, hunched over my book and visibly wincing. The niece says to the mum 'Oh my. They're so hyper!' and the mum laughs. I think to myself, 'maybe because it's Saturday night and way past their bedtime?'. But I say nothing and pretend to read my book, wincing as I go, trying not to regret my largesse.

I do this because I'm thinking 'Ahh, a pregnant mum with 3 maybe 4 kids, life can't be easy. She probably couldn't control them even if I asked her to. Let's be gracious to her...'

Then my dryer cycle is over. I check my washing. Some is still wet. A few minutes later their wash cycle is over. They need to use a dryer now. There are only 2 dryers, remember. And while they have been washing their clothes, I have been using both the dryers. It is now 9pm and the landerette is to all intents and purposes closed. The room is oddly quiet. They sit staring at me, waiting for me to take my washing out. They seem vexed that I'm not doing it faster. I say, nervously, 'Erm, did you want to use the dryer?' They say 'Yes.' I say, 'do you mind if I still use the bottom dryer if you take the top one? As I said before, I really do need to dry my washing tonight - just these last few shirts that are still damp, it's just one last 15-minute cycle. I don't have the ability to do it at home.' They say 'yes, we do mind it's 9pm and we have 3 machines full of wet washing and very small children' and insist on taking all the dryers in the launderette, and kick me out. They kindly let their kids open the door for me as I go.

I reflect that if I hadn't changed their money, they couldn't have dried their clothes in the first place.

I leave feeling betrayed. Is this normal, guys? How much of my upset about this is because it was genuinely indecent, and how much of it is because I'm hormonal, female, childless, lonely, foreign and broke? Were they in the wrong or am I a douchebag for not wanting to be kind to a pregnant woman? I'm torn. I don't know if my feelings about this are right.