Try some coconut oil on the patch! At the very least it will moisturizer and help protect the skin, and it's all natural.
If it helps, I am 27 with a 2 year old daughter and hope to get pregnant again at the end of this year. I have no history of BC either, but found a lump in my right breast and am awaiting an ultrasound. I can attest tote anxiety and fear that comes along with these worries, but I do know that stressing about it strains the body and make symptoms worse. So try and rest and enjoy life for what it is until you can get some answers!!
Much love to you and enjoy your pregnancy! I loved being pregnant (despite my anxiety! )