Worried about cervical cancer

Hi, I was hoping people could offer any advice..... feeling sick with worry. I had a baby 12 weeks ago via c-section (this was my 3rd baby) During the pregnancy, I noticed slight brown tinged stains on my underwear. Midwives didn't seem concerned. I bled for 6 weeks after the birth and have had a period since (all seemed ok albeit a little heavier than before). I've noticed the slight brown tinged stain again on my underwear, I only notice it on my pinky/peachy coloured underwear and in my black or grey ones, it looks whiteish. I've googled this (I know I shouldn't but we are all guilty of this) and said it could be cervical cancer. I don't appear to have any other symptoms. I've just booked my smear test but it's not for another 3 weeks. I've not had one in so long and yes I am ashamed of that and will not miss any in future. Can anyone offer any advice please? I'm out of my mind with worry. I keep looking at my baby and getting upset as scared I won't see him grow up

I hope someone can reply and offer any advice x