Can I phone my early pregnancy unit bleeding

lo

I took a pregnancy test Wednesday and it was positive 2 days later i have started to bleed it stared light but is going more like period blood and slight cramping like period

I took another one around tea time today was negative

Late tonight I went to the toilet as I was really cramping and passed a large clot. Now it’s back to being like a period ?

Can I phone my early pregnancy unit about this I hear there open 24/7 ??