Someone please help I'm a bit scared and worried.

Jo
So my af was due for mon 28th but yesterday 24th and today have been bleeding really quite light but sometimes brown sometimes red. Don't ask me why but I just did a hpt and got a 2nd line within about 2 mins? What's going on. I don't want to believe am pregnant as I'm bleeding. I've been ttc for over 4 years now. Someone please help