Help, ttc, brown spotting but neg test

[cbrook]

Hi, I'm wondering if anyone can help too, I've been off my pill since feb, had a period in April then 3 weeks later start of May, I've been due my af last week but I've only had brown dc and it's only in the mornings a little during the day, based on a 28 cycle I'm now 4 days late, I did a test Tuesday but not in the morning and it was neg, not sure what to do now, should I wait or go to my docs? I also had a very upset stomach for two days and have been feeling tired and a bit quesy but bcoz I got a neg test tues I don't think I'm pregnant, ps my husband and I have only been ttc for two months, I would really appreciate any advice x