If pregnant can an ultra sound see anything at three weeks after sex.. Is a blood test accurate three weeks after sex. What early pregnancy signs are there at early stages? 10 negative urine tests plus one blood test.. Are they accurate? Another home pregnancy test at one month after sex. Another negative.. One period heavy flow but only three days another period at four days ( which is pretty nornal) enough blood to fill up a pad... How heavy is implantaion bleeding. Am I pregnant or parinoid or tests to early. Please help.. Please

No if you had a full period, you should not be pregnant.

A blood test at your doctor can tell.

I had one three weeks after sex... is it accurate?

From the doctor? Yes.

A home test, using first urine of the morning will be correct 4 to 5 weeks afterwards.

Yes I got a blood one drawn in the ER exactly three weeks after sex and then just did a urine test a little over four weeks after sex and I followed the directions exactly