Hi. I am 22 and really not ready to bw a mother, so I'm freaking out over the possibility of being pregnant. The facts are: I have a usually regular menstrual cycle of 27 days, and had protected sex around the days of ovulation (I would say 3 or 4 times on days 10-13) and practiced the method of withdrawal the days prior (3 times on days 5-8). Now, at day 18-19 I experienced some brown spotting, which has never happened to me before, that I can recall. I'm freaking out over how possible it is that this could be implantation bleeding. Or if it is just rhe result of something else, such as stress or mastuebation or the beginning of a period that is coming early (havent had it that soon before, but during thw summer, because of the sun and the swimming, it has thrown my period a little off in the past).
Thank you in advance