Help😓

March 18th - 22nd, I’m assuming it was my period, I had light bleeding, but that period was very painful to the point where i didn’t want to move. It lasted 5 days it was extremely different from any other period by the flow and how much pain I was in. I ovulated or assumed April 1st - 7th. BTW my boyfriend and I enjoy our sex life so we are always doing the do lol, which means even on fertile days. My cycle was suppose to come on the 20th of April. My period was 11 days late before I seen blood. May 1st was the start day, but it’s totally different from a period. I have no clots, the blood goes from dark red, to brown. It doesn’t fill up the pad, but it’s extremely light but more than spotting( which is referred as a couple drops correct?). It’s little to no cramping, usually going in and out. So now it’s 2 months in a row where I’m finally iffy. I am honestly wondering am I pregnant. I have back pains, nausea, tiredness, ect. I haven’t been trying to stress myself out. I’ve took test almost 2 weeks ago, it was negative. I don’t know what’s going on🤦🏾‍♀️🙄. I’ve tried to stay occupied and busy to not even focus on what I am going through. I’m debating if I should go to the ER at this point. What are you guys thinking?