Some bleeding after birth is expected. It is called lochia, and it is the womb clearing its lining and the site where the placenta was attached. It starts red, fades to pink or brown, and usually tapers over several weeks, though the exact pattern varies.
It is also normal for bleeding to flare for a day or two when you have been more active or have been feeding, because the womb contracts. A little more than yesterday is not by itself a reason to worry.
What should not wait is a different pattern. Soaking a pad within an hour, passing clots larger than a golf ball, a foul smell, fever, pelvic pain, or feeling faint or breathless can point to retained tissue or an infection of the womb, both of which need prompt assessment and are treatable when found early.
Assessment usually involves your history, a pelvic examination and sometimes an ultrasound to see whether anything remains in the womb. The result decides whether you need observation, medicine or a small procedure.
If you are unsure which side of the line you are on, message the clinic and describe the pattern. Do not wait for a routine postnatal visit if any warning sign is present.