Period or remaining lochia?

Hi mummies! I’m a mother of 3 but am still learning new things every day. Please bear with me… I’m 2months pp, birthed via c-sect, lochia previously stopped after confinement and I have been exclusively pumping bm for baby3 since I was day 1. Recently I’ve had intimate times with my husband and realised I started bleeding again. The bleeding is not alot and frequent, but it does soak up 1/3 of panty liner. I’m not sure if this my period coming back or if it’s anything else. I did not experience this with my other 2 pregnancies prior so I’m pretty confused about it. My supply did not dropped, neither did I feel like I was having “pre-period symptoms”. Any advice please?