Yes
You did not get a period while you were pregnant.
There is a high chance you probably are pregnant. Best chance is to get a test done.
Three weeks pregnant is a week before you miss a period so it is impossible to know it is twins. If you are three weeks after conception, (5 weeks pregnant)it is still early to see a heartbeat.
You ovulate two weeks before menstruation - thus the soonest you'd skip a period is that first period, two weeks after you get pregnant.
there is a chance you can be pregnant
conception occurs appr 2 weeks after ur last period not before because if you got pregnant before your period your period would not come on conception occurs appr 2 weeks after ur last period not before because if you got pregnant before your period your period would not come on
Depending on when you ovulate - yes.
They count pregnancy from your last menstrual period not from when you actually had sex and conceieved. So if its been 5 wks since you had sex and got pregnant but you had your period like a week before that then you'd be 6 weeks pregnant. Or if you started your period 2 weeks before you had sex then you'd be 7 weeks pregnant.
You start missing periods as soon as you are pregnant. So if your period was due in two weeks or three weeks from conception - it won't happen.
hamsters are usually pregnant for about three weeks
I am not sure what you mean by 3 weeks pregnant as this is 3 weeks after your last period when you would not have a positive test. You get pregnant 2 weeks BEFORE your missed period. Whatever you mean by three weeks pregnant a sauna this early would not have any effect whatsoever. The human body maintains a normal internal temperature whatever the outside temperature. High fever may have an effect but not a sauna or similar.
A sow is pregnant for "three months, three weeks, and three days", or 115 days total.