period?

so I am 7 weeks pp and at my 6 week appointment I started the pill 2 days after I started the pill I had sex with my husband he pulled out just to be cautious however I think I just started my period but be cause I'm paranoid im worried about it being implantation bleeding so I was wondering when did some of u ladies start ur period after baby and did u start tampons at this point or would u if it was ur period or should I stick with pads still?