When to test

I've been off the pill since the end of March as I'm trying for a baby. I've had periods whilst on it and when I came off my pill my periods continued monthly give or take a few days. I had my last period on the 22nd June and it lasted just over a week onto the 29th of June which for me can be normal. Since then I've done a lot of bd especially around my ovulation days like glow informed me. I was due on today but had no signs of my period like the usual cramps etc. I've just had the slight brown discharge but nothing more. Could I be pregnant or is this just the start of my period? I did a test a few days ago but it came up negative and I'm not sure if I tested too early still? Any help and advice would be much appreciated thank you!