No, a 4-5 day spread is pretty normal and being really heavy doesn't matter that much. Your OK.
I dont think that really makes a difference, as long as you have your period you are able to get pregnant unless something else is wrong with you that enables you or makes it difficult for you to get pregnant
If it was heavy, then no, it's unlikely that you're pregnant
It is possible that you could be pregnant, take a test to know for sure
it should be. or the calf could "get stuck". the vulva will swell prior to giving birth unless the calf comes really early.
Yes
Could be implantation bleeding. If it is your actual period then it's unlikely that you are pregnant.
no it could be that your cycle decided to take a change due to hormones,stress,medication,etc.just because your monthly was early doesnt mean your pregnant
Yes, HCG is only in your body if you are pregnant, you could be either very early on, or you could be having a chemical pregnancy.
Yes. You could be testing too early.
If you had a period after you had sex, you're not pregnant. The uterus is shedding its lining, which, if you were pregnant, it would keep to nourish the embryo.
It is possible to be pregnant and still have you're period. However, having a period a week early or a week late isn't all that uncommon. If you're really unsure about it the best thing to do is just take a pregnancy test. That's the most reliable method.
If you are having a period, you are not pregnant. However many women confuse their periods with vaginal bleeding and vaginal bleeding can be a sign of pregnancy particularly in early pregnancy.