Concerned about pp period


I’m 8 weeks pp, i got the clear from my midwife at 6 weeks pp to begin normal activities like sex and working out, it was all fine until a couple days after that i was cleaning the house and squatted to reach some stuff under the counter, i started what i thought was my period that day, it was a very heavy bleeding, even heavier than my pp bleeding, it lasted for 5 days and then stopped (Dec 25- 30) last night i had sex and it hurt in the beginning, i just thought that after not doing it for like 10 days it was normal to have a little bit of pain again (since i delivered vaginally) and then i woke up today with more bleeding, not too heavy but still, could it be something to worry about? Is it normal to bleed in between periods after having a baby?