Concerns😟

I got my implant July 27th and have had 2 periods a month since. I haven't had a period since the beginning of Nov and my husband and I had sex Sat and Sun he didn't finish inside me either time and pulled out before. I'm just worried about pre c and the possibility of getting pregnant again and i've had some white discharge today but not alot.I know the implant is 99% effective but i'm just overly paranoid.