You cannot have a true period while pregnant, but you can have bleeding that might mimic a period, but it's usually lighter. You can take a Home Pregnancy Test . Depending on how that turns out, you'll know what you want to talk to your doctor about--pregnancy or strange periods.
I am alarmed that you stopped taking your thyroid medication. In this article on http://www.webmd.com/cancer/tc/thyroid-cancer-medications>Thyroid Cancer it states "Thyroid hormone medicines to replace necessary thyroid hormones that are made by your thyroid gland. If your thyroid gland is surgically removed, you will develop hypothyroidism-having too little thyroid hormone-and you will need to take thyroid hormone medicines for the rest of your life."
Untreated hypothyroidism (click on link in previous article) can lead to many health problems, including coma. Please see your doctor immediately to discuss your thyroid.
I'm not sure what you mean by "foreign" birth control pill. There are fake medications being produced and sold cheaply online and sometimes through black market resources.
Lower back pain is not a typical pregnancy symptom until you're halfway through your pregnancy or more, when the baby is getting heavy and your stomach is really popping. I'd ask the doctor who prescribed these pills what is going on for you.
No one can pass on identical twins. As you've noted, it's the fraternal twins that can be inherited--but let me explain.
Experts discovered women in certain families naturally tend to hyperovulate, so they may release several eggs instead of just one each cycle.
The reason it sometimes seems to 'skip' a generation, is because a male member of the family is carrying it, so it's not expressed (visible) because men can't get pregnant. However, his daughters may get it from him, and have twins of their own.
So your husband could pass the gene to his daughters, but he can't make it more likely for you to twin. That would have to come from your mom/dad.
No one here can tell you whether or not you're pregnant. Unfortunately, many things other than pregnancy can cause 'pregnancy-like' symptoms, which is why no one diagnosis pregnancy based on symptoms alone.
Depending upon the typical length of your cycle, you should be able to take a Home Pregnancy Test around Sunday.
Whatever bleeding you've been having every two weeks, isn't a normal period and should get checked out. A pregnancy test on July 9th would have been too soon to tell anything for July 4th, and of course, July 10th hadn't even passed yet!
You could try taking a Home Pregnancy Test now, but you may need to wait until August 1st-3rd for the most accurate results. Read the directions on the box of whatever test you buy and follow them.
You cannot have a true period and be pregnant, however you can have bleeding that mimics a period during pregnancy. If you have five negative tests, I don't know why you think you're pregnant. Bleeding is not a sign of pregnancy, nor does bleeding interfere with the accuracy of a Home Pregnancy Test.
However, you could always see your doctor for a blood pregnancy test to get a "for sure" answer. The doctor could discuss the missed period, too.
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