Light period of implantation bleeding? It's been a week of spotting?

if it was implantation bleeding then you would already be about 4 weeks pregnant so if you are worried you can just take the test. and yes change in lifestyle can have an affect on your period. and if you didn't use a condom for a minute or whatever he still could have pre- cummed inside you. which you nor him feel at all. its just a drop and that's all you need to get pregnant. so the best thing you can do is get a pregnancy test. i had a period early november that was normal then end of november that was just spotting and im 30 weeks pregnant. but again just take a test to be on the safe side. hope this helps