Everything will recover, it's hormones. Don't even spend money — it's like this for everyone, get checked. I work in a professional hair cosmetics store.
Do you take vitamins? In winter I almost went bald, it was falling out so badly, like 10 hairs at a time in my hand. I started taking Elevit. It contains biotin, hair started to regrow — at first so many tiny hairs, it was really noticeable, then overall it got thicker. This supplement worked for me. I've already been taking it in my second trimester.
In any case, you need vitamins — you can apply or rub in whatever externally. You need to nourish the body from the inside. And the most important vitamin for hair is biotin. So look for it in the ingredients.
Burdock oil works great for me — I buy it at the pharmacy. I do masks twice a week, leave them on for a couple of hours, then wash them off; I'm happy with the results. I use the regular one and the one with red pepper.
I've started having the same problem too: I have hair extensions, and both my own hair and the extensions are falling out, even though there were no problems before! I think you need to take vitamins; professional products won't help us because the problem is coming from the inside.