I had PROM at 16 weeks with my daughter and when I went to hospital they did a swab which can tell them if it is amniotic fluid or not. The swab on me wasn't conclusive, but I took in the liner i had been wearing (I know it sounds yuk) but that was 100% positive it was amniotic fluid so they did an ultrasound 2 days later at my ob which picked up the low fluid levels also.

Luckily for me after a week of bedrest the fluid levels returned to an acceptable level the following week so I continued with the pregnancy until my waters broke (again) at 37weeks.

So, keep your pad if you get any more leakage so they can swab it.

Also, both the nurse and my ob didn't believe me when I told them it felt like my waters had broken, but I was adamant because it had felt like that with my son. So if you really think it was you might have to push for an ultrasound to check.

They did tell me that I would probably go into labour in 48-72 hours, so I would keep an eye on things just in case.

Also, no sex allowed if your waters have broken due to risk of infection...

Goodluck, hope everything goes ok.