ovulation questions.....

So I'm pretty sure I either ovulated right around the time I was supposed to start my period.... (Feb 2). I'm assuming that would naturally put it on hold. My question is, how many days after ovulation and implantation would hcg show in a hpt. Technically I'm 7 days past my AF, but if I ovulated at that time, then it's not been long enough for nature to take its course....correct? I have none of my normal indicators that I'm about to start. Except sensitive nipples. No cramping....slight pinching a day or so ago, but that's it. When can I expect an accurate test?