TMI, (picture) When to call hospital? Ftm and nervous!

So I had cramps all of last night. Woke up at 8 this morning uk time with period like cramps. They got a bit intense so I presume they're contractions because they're only coming every so often. Started timing them. Pic below. Then I go to the toilet and have blood discharge type on the tissue. When should I call the hospital? Ftm thank you for your advice!