Postpartum spotting

Cynthia
OK, I haven't been on in months. My daughter was born Dec 18. I have been breastfeeding as well as formula supplements. This morning at 5 am, woke to very light pinkish brown spotting. It has not evolved to full bleeding. I have only had sex twice since giving birth, both unprotected, both times he pulled out. I have not had any periods yet. I'm eating for the midwife to call back, but I'm wondering if any of you had a similar experience, and ended up pregnant or not.