Advice please !

Shanequa
So my TTC journey has been/is very looong ! Almost 5 years and nothing. Finally broke down and went to an infertility specialist and they told us my husband has no sperm😟. We still have sex regularly lol because it's fun of course. My husband is scheduled for a biopsy on July 12th to extract the babies (hopefully) but today I went to the bathroom and when I wiped there was a light pink discharge I'm guessing is the appropriate word? So I wiped again the same thing very light. AF is due in 4 days. I'm VERY nervous to test ! What should I do?