It depends how much he cum in you. Lets say that your boyfriend masturbate earlier that day, then its less likely to get pregnant because he already ejaculate most of his sperm out in the beginning of the day. And while he might of cum in you while sex that day it mostly doesn't have enough sperm to pregnant you. But lets say he didn't masturbate that day or the day after that, then that day when he cum in you, ur more likely to get pregnant cause he shooting straight shots of sperm in you because its been building up over those two days, I'm talking trillions of sperms. As if he masturbate ealier that day then he would already be shotting thousands, which is not enough to get pregnant. But dont get me wrong, you still likely to pop out a kid. But you have to be carefull cause guys sometimes have straight shots of cum with no sperm cause he masterbrate alot. Yes stress can delay your period. I know it did for mine. But one clue that trigger you that your pregnant is your breast hurting like heck. AND its normal to paranoid about that . So dont worry about it, and no it wont make u think your pregnant.

This is terrible advice! How many times someone ejaculates in a day has NO bearing on your risk of pregnancy.

because you just finished your period, the chances of pregnancy are very low, however you can test if you miss a period