Should I be worried ??

Ok so this might seem a little bizarre and TMI !! But here goes ..

Last night I was woken up from my sleep from having an orgasm, (while sleeping) 😳 and straight away I started cramping, lasted for about 60 seconds, I thought nothing about it and went to sleep again, but then this morning when I went to the toilet and wiped, I saw brown discharge, not a lot but I'm slightly concerned, I'm 7 weeks and 3 days pregnant with my rainbow 🌈 has anyone experienced this before and does anyone know if I should be worried?