My gf's periods are never really on time, usually a week late or so.
But this time her period was actually on time (within a day or so).

But like 2 days before she was sposssed to start , she started, then stopped the same day.

Then just today she started , she was like "im 100% sure I started" then like 4 hours later she said it stopped.

Tomarrow is the day its spossed to start, but even tho she's usually late, when ever she starts , she stays on . She's never had it start / stop before.

What do you guys think it is?
Is this a sign she might be pregnate?