My last period was 14 of January, I had sex on the 27 of Jan, my breasts are sore and they feel heavier, I'm having little discharge and I'm always wet. I'm tired, my back aches a bit. My next period is due next week 14 Feb, am I showing signs of pregnancy?

Possibly... maybe not. Many things could cause these symptoms.

You will need to wait until you get or miss your next period.

You would be one week pregnant at this point, more or less, considering it takes about 3 days from sex to conception.
At this point, there is really no signs, and no you would not be getting heavy at this point, that does not even happen for a couple more months
And the signs you show would be someone who is 5 or 6 weeks at least.

The first sign is normally a missed period.

So all you have to do now is just wait. Wait to see if you miss your period, if you miss it,
Then you wait two more weeks. At that point test with the first urine of the morning as soon as you wake up

This would be my 4th pregnancy if I am... My last pregnancys I was only feeling sick but at the moment I'm having symptoms I had in my last pregnancys but I can notice my breasts are sore and they feel heavier. Soon find out I was just curious.

Maybe because I've had 3 pregnancys, I'm showing signs early, don't know