Help please

So I had sex a week ago on the very last day of my period. I’m on birth control and take it perfectly. My boyfriend wears condoms and he always pulls out before finishing. I checked the condom afterwards and i really don’t think I found any holes were the semen was leaking out. I check my cm daily and yesterday I checked twice. I usually go up into my vagina and feel my cervix for it. The second time I went up I had this brownish bloody discharge. Is this implantation bleeding. I’m not sure what the chunks are either. I’m really worried