weird discharge

So today I had this Weird discharge that I am confuse of: according to the calendar I was suppose to ovulate last week and I did noticed it only one day. However I took my nexplanon out on the 12th of this month. We had been taking care as of when we have intercourse. I do know that sperm can leave up to 5 days but my question is if I had intercourse couple of days before taking the nexplanon and got my period and ovulated as of what I think.  So what can that clear, Strechy and some brown looking  discharge Can be ?