Testing to early? Or not pregnant?

I came off the pill on the 2nd of June and I had my withdrawl bleed, I've had unprotected sex the whole month of June I'm not trying to convince but I'm not stopping it from happening. Apparently I ovulated for the 11th to the 17th of June, and I was meant to get my period on the 30th and now I'm like 4 days late? I took a pregnancy test on the 28th and it came back negative. Should i take another test now or wait a week then take one. Basically I just wanna know is it still possible for me to be pregnant. Also took a test today and it's still saying negative, I'm really confused because I've never been late for my period. Did I just ovulate later then I was told or what? I'm so confused. Anyway going to the doctors tomorrow to get a blood test. Fingers crossed!