A week after FMP is what everyone told me, so it will be a more accurate answer. I got a cheap Walmart test, but when that came out positive I got a couple more from the dollar store and they where positive as well. Test as much as you want. But the most accurate test would be in a doctors office, whether it bea blood or urine test.
You could well be pregnant try testing again tomorrow with first morning urine x
Test again in a couple more days 3-4, I tested positive 3days after my missed period.