Im glad to see that you are going to see your GP, there are often Qs asked on here by women who seem to think they will get as good an answer as they would seeing a GP
Well im sure you are aware what the worse case scenario could be with the pink tinge.
BUT some women get whats called an implantation bleed in early pregnancy that is just a tiny spotting of blood, it doesnt mean baby is in danger
Others get a discharge of old brown blood around the time when their period is due, again no danger to the baby.
I had spotting after sex during the first few months because of cervical erosion (my midwife said), again I had a healthy baby.
Get an appointment asap tomorrow and give your GP the details and advice.
If at any point bleeding gets heavier or you experience any pain in your abdomen or shoulder then please call your early pregnancy unit at your local hospital or go to A&E immediately.
wishing you all the best for your pregancy