PP Period Help!

I saw my doctor yesterday for my PP check up. She said my stitches were still dissolving but only limited me on sexual activity for another 6 weeks.

I forgot to ask a few questions so I left a message today. Lo and behold, my period came today at 6w1d PP! The nurse said I was okay to use tampons which I prefer but I'm hesitant.

I used to use S+ because my flow was already heavy. Would it be okay to use S+ this soon or should I start back smaller?