Some advice please ladies!

Just wondering it’s been 4 days since I got my BFP! And after 2 chemicals in April and May I’m extremely nervous about it happening again, I did do another test Sunday just to see if the line had got any darker than on Friday and it had,

But I really don’t wanna test again I’m scared to incase the line is fainter again :/ my question is over the past few days my boobs hurt more and more each day probably sounds stupid but would you say this is a good sign as my hormones are probably getting stronger hence why they are hurting more?