5 days late on last period, neg preg test and had it.. now 3 days late on this period.. wishfull thinking to be pregnant?

No,each cycle is new: Each cycle is another chance. It is true that if you go cycle after cycle trying to get pregnant and don't, you need to consider infertility evaluation after a while (10-12 cycles). But if you are young, have regular periods, have sex every other day starting 10 days after the first day of your last period until day 20, you have good chances of getting pregnant. Good luck!