Help

Hi everyone,
I'm not sure if I should ask my question here, so sorry if I posted in the wrong topic.
I'm wondering if I'm pregnant or not. I'll walk you through it starting from the first day of my last period. That was around October 22nd, it could have been earlier but also later. My cycle is usually 28 days, but that's because I regulate it with the pill. Without the pill, I'd have an irregular cycle. I've been taking the pill every day as far as I can remember for the past month (though I might have missed one because at one point I grabbed the wrong pill and got confused with the days on the strip), but not at the same time each day. Sometimes I take it at 6 AM because of work, and other times not until noon because I can sleep in. After some research, I saw that the pill is 99.9% effective only if you take it at roughly the same times (never knew that, but the internet says so). I did an online ovulation test on the internet to see when I was most fertile, and guess what, it was on the day I had sex, unprotected sex.
About 8 or 9 days after the sex, I had bleeding. My whole body felt weird and it didn't seem like a normal spotting to me. I only get that kind of spotting when I'm taking my pill continuously (my doctor told me not to take it longer than necessary and preferably not at all because of my past history with the pill). So for me, this was just a new pack, so to speak. The bleeding wasn't heavy, it was red and lasted about two days.
I got tested for a bladder infection, but that wasn't it when I had that bleeding. The day before yesterday, just to be safe, I submitted another urine sample, but again no bladder infection and they couldn't find any blood either. The previous time there was blood, and there were 7 days between the first and second submission.
Besides that, I have symptoms like difficulty urinating, constipation (well, I think so, normally I go 2-3 times a day and now only once every 2 days). It also feels (sorry for the description) like something is being pushed from the inside, near my anus even though I don't need to poop. I regularly have lower back pain, strange lower abdominal pain, heartburn, unexplained fatigue. When it's 8-9 PM, it feels like it's already 11 PM or midnight, and I actually want to sleep and can sleep. Lately I've also been quite emotional and can cry about everything. This could also be because I'm in a pretty stressful situation.
I've already taken a test, but it might have been too early because it was negative. Should I take another test or what do you think I should do next?
Thanks in advance!