Possible Pregnancy: Late Period After First Sexual Encounter - Symptoms & Concerns

Question
hello,
i had sex for the first time about a month ago, on the 25th of september, and i was on my period (which began on the 22nd). we used a condom, and he pulled out long before he came. we did it again soon after, and there was blood on the condom which i assume was probably remains of my period (we used the same method, pulling out and also a condom).
my period was due on the 19th of october, and it's now the 21st and i still haven't got it. i've been really really stressed all month about whether i'm pregnant, so i'm hoping it's just been delayed because of that.
i took a pregnancy test about a week before my period due date, and it came out negative, but this might not be very accurate.
the only 'pregnancy' symptoms i have are sore breasts, and i had a paste like discharge which has now changed to a slightly clearer discharge, but i get these symptoms before my period starts anyway.
last night there was a decent amount of pinkish, light reddish blood on my underwear, and i was excited because i thought i was beginning my period. unfortunately, it is the next day and no signs of my period, just discharge, and i'm really worried that it's implantation bleeding.
i still have had no symptoms of pregnancy, and the only way for me to be pregnant would be if the condom broke i think, and as far as i could tell there were no rips but is it difficult to tell when a condom breaks?

Answer
You are worrying yourself unnecessarily. The chances of pregnancy in your case is extremely slim. Anyways it is normal for periods to be delayed a couple of days, especially under emotional and psychological stress. Just relax and you should get your periods within a week or so.