Freaking out

Hey girls so firstly I have an appointment with my doctor tomorrow....just wanted to kinda voice my fears out loud and get some opinions.

I had my 13+ week scan last Wednesday all was good,I'm now 14 weeks but ever since last Thursday /Friday I've been quite crampy on and off.at first I just put it down to round ligament pain but now I'm super worried it may be something else as I'm feeling lots of 'pressure' in my lower abdomen too

It's the kind of feeling you get if you hold your pee for ages!!! Now the other thing is I've been constipated for a few days so I know that hasn't helped. Today I had a beige coloured discharge which was odd so I phoned my doctor and got an appointment for tomorrow evening. I had bloods and urine done last Wednesday but haven't heard anything back so I assumed it was ok

The pain isn't there 24/7 and seems worse when I'm sitting straight up!! Any ideas or reassurance is so appreciated xxx