If you are 13 days past ovulation, which usually occurs around day 14, that's 27 days. If your period isn't due for 6 more, that's a 33 day cycle, which is on the long side. So you don't really know where your ovulation occurs, do you? Unless you took your temp or used other objective measures of ovulation time, you could be off on that by 6 days. So, pregnant or not, your test is likely to be negative at this juncture.
If you're used a bargain store pregnancy test, it could be less accurate or old/expired. Double check on that.
I understand why you really don't want to wait to find out - there is a lot of emotion going on. But if you test again and it's negative, what does that tell you? That you're not pregnant, or that it's too early? I'm not sure the answer is going to tell you anything to relieve your anxiety. Constant testing is just going to be an expense right now. If your doctor will see you early in the week for a blood test even before a missed period (given that you have some unusual symptoms), that's going to be more accurate.
In the meantime, follow the advice that women's health counselors always give during this "limbo" time: assume you are not pregnant and use contraception, and assume that you are pregnant and avoid alcohol and other things you shouldn't be imbibing.
I hope you get an answer soon.