My fiancé has a regular period ten days after we had sex she started her period five days early started light and the next day got really heavy could she be pregnant they took a blood test five days after we had sex and came back negtive

Let's see - you had sex, she had her period, she had a pregnancy test, it said she wasn't pregnant.

My guess? She's not pregnant.

This was stupid this **** isn't no help

The pregnancy test was took to early and there's a thing called implantation that can b mistaked for a period

Why did she go in for a blood test so early? Best to wait until a period is actually missed. I'm surprised her doctor ordered one.

Implantation is not often noticed, and when it is, it usually is merely some light spotting for a day or two. Some women, however, can have some bleeding in early pregnancy, and they may mistaken that for a period.

Since you already know the test was done too early, why not have her take another one?

Usually sex that close to a period would not result in pregnancy, but it is possible. It is likely this was just an off period, which can happen from time to time.

JudyKayTee's answer was correct... from what you stated, it is unlikely she is pregnant. Since you are unsure, have her either try another test at home, following the directions carefully, or wait until next month and see what happens with her period.

She was getting on birth control and there having her come back and I've seen cases like her's but I'll find out tomorrow