As you already know I developed blood clots from PICC line and I had to self inject for 90 days with Clexane. I hated it so much but made it easier for myself by doing it just before my nightly shower.
I don't have any other advice re blood clots but I am sure your team know what they are doing and if you notice any further changes eg more swelling go straight back to the hospital.
All the very best with the rest of your chemo treatments and I hope you don't have any more dramas with your port.
Best wishes
Joy xx