Awww,sorry to hear that,well u really need to go home whether you like it or not if u both didn't get marry,thing is 3 months still long way to go,i wonder if its acceptable to say that go get married hence u mention that the relationship isn't working well,since you're here in UK other member will reply to you if u can bring the baby w/ you as we don't know pretty much the law of the UK,
If you are in PI,obviously the responsibility of the baby is under mother care until 7 yrs old