Pregnancy scare

I had unprotected sex and im not currently on birthcontrol, it was at the end of february, right before I was supposed to get my period. I ended up not getting my period, and my last one was in january. This may be a silly question but I was just...

wondering if it's possible for me to get pregnant and miss my period all within 4 days before im supposed to get my period. It seems so fast, because everyone else I know still got one or two periods even while they were pregnant. I havent had any spotting or anything, but I have had all the symptoms as if im going to get my period like the cramps, bloating, etc. Could the egg really implant and cause me to miss a period just 4 days before im supposed to get it? Im scared, and know ii should have been safer. The other situation is the only other person I've had sex with was my ex-boyfriend but that was 2 1/2 months ago. Could it be his also? I've only had one period since and knowing people who hace had their period only to find out they're 8 weeks pregnant makes me nervous. IF I am pregnant who's would it be more likely to be? My not so smart one night stand or my ex-boyfriends? And one last thing, is there ways to find out the father through dna tests before the baby is born? Of course me stressing out could be the reason I am 3 weeks late but maybe some answered questions will help. Thank you.

It is tough to determine who the father is. You might want to pick up a home pregnancy test and see what it tells you. At least then you will know what your condition really is.

Yes, it is possible to miss periods while you are still pregnant. No, DNA tests can not be done until a baby is born. Take a test as soon as possible.

I'm not sure who you had sex with first, the ex or the random guy
but when you had sex with the first guy and had your period after, providing if your period was normal, lasts normal amount of days, normal amount of blood, on time etc.. then it's most likely not him.
But if you didn't get your period after you slept with the first guy then he could be the father.

Yes it's possible for the egg to implant at ANYTIME. Doesn't matter if its a day after sex, it will still implant.
If you are getting the symptoms and no period, you really should have taken a pregnancy test by now.

And another thing, wear protection please. You wouldn't like people to think you're a sl*t. You can catch STIs that way.. especially on one night stands with strangers.

im well aware of that. people make mistakes it's not something I do on a regular basis