Pregnancy Scare! Please help me!

DISCLAIMER : *Before we start, I realize there are a lot of women out there trying for a baby and I don't mean to be insensitive by posting this. I would be unable to care for a baby at the moment unfortunately*

So when I first looked at this group I noticed the main creator had a list I should fill out. Basically, I was worried that I was pregnant last month when I got a period that seemed more brown/lighter than usual.

1. Normal cycle length : 28 days

2. I had sex April 28th and I had missed a birth control pill but doubled up day before. I only used withdrawal method on this day.

3. I have now experienced two periods since then (but I've read so many things saying women get periods while pregnant still for the first months)

4. I just now finished my second period, which was bright red in color, heavy enough to fill at least 6-7 pads in a day for two days then normal bleeding for 3 days after and lots of blood clots.

Note; Ive taken 6 pregnancy tests which all came back negative. A variety of FRER and Clear Blue.

The only "symptom" I could say I'm having right now is I THINK I have A prominent vein near my groin area. But ever since I read veins appear I feel like I'm more veiny when my SO says nah.

I'm just so paranoid. Anyone got any advice? I feel normal but when you symptom search and read non stop about all these CRAZY "I didn't know I was pregnant stories" it makes the anxiety unbearable.

I'm sorry if this makes anyone upset.