Sore boobs after period! Ttc over a year now

Hi guys
​It's my 1st time being on here, I've been ttc for over a year now it's starting to stress me out. My cycle use to be every 28-30 days now it's all over the place. I came on my period on the 14th off March, it was a lot lighter than usual and  only lasted 3 days with and extra 2days off just brown spotting. Since my unusual period my boobs have been really sore and tender. This has never happened to me before. Please help me! I don't want to take a pregnancy test I get scared if it comes back negative.