Hi @Trikki2 .... as the other lovelies have said ..... chances are it is a seroma (a collection of fluid in/around the surgery site that causes pain & lump.) Turning over & lying on that boob is a tad uncomfortable & sore.
I felt a lump in my OTHER boob about 6 weeks ago & also pain 360 degrees around my nipple area of my surgery site from Mid Jan. I had to wait 3 weeks to get into the Mammogram/ultrasound at Port Macquarie (my preferred site) .....
Yep, seroma on the surgical site that should 'absorb' shortly - otherwise watch & wait .... and the 'other lump in the other boob' is nothing to worry about - also a watch & wait - I'll have both tests repeated in Nov/Dec.
Try not to worry (difficult tho it is!) Try not to 2nd guess it - chances are, it isn't! ;)
Good luck on Monday. xxx