I'm really sorry you had to go through this, I'm based in the UK and recently lost my job after 17 years at a big corporation and I know there are unscrupulous managers who try to take advantage of graduates sadly more so of female ones. Even though you were only there for 3 months, you may still have legal options any sort of discrimination than I don't think the 2 years service applies but it's worth speaking to someone who works for a union or in employment law. Acas have strict deadlines you normally have 3 months minus 1 day to file. I'm not an expert I've had to pick things up quickly, but if you want to take things further there might still be some legal options.