First Trimester of Pregnancy Question

Hi there, I’m about 6 weeks pregnant and had a bit of light pink discharge. It was just a couple of wipes worth and after that turned into slightly brownish discharge. This lasted a few hours and the nex day was all clear. Today however I’ve got some brown discharge again. Wouldn’t be enough to fill a pad or anything. I wouldn’t really worry about the discharge itself if it wasn’t for the constant period pain like pressure I’ve been feeling. This is my second pregnancy and with the first I didn’t have any symptoms what so ever for the first trimester so this makes me a bit nervous. Also, some nights I experience quite intens pressure with some shooting pain in the rectal area. I’m not having a scan until later this week and think I just need some reassurance and I can’t ring my GP because it’s a public holiday. Cheers :)