About Fertility, Ovulation And Pregnancy?
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I will try to answer your second question first, but beforehand, you should first explain, what is the usual distance between your periods each month? To be able to answer more accurately, it must be known with certainty what is the distance between your menstrual cycles. Because the data is not included, I will assume the distance between your menstrual cycles is 28 days.
Ovulation occurs about 2 weeks before the estimated next menstruation. If the first day of your last menstruation is December 17th and the distance between your menstrual cycles is 28 days, then your next estimated menstruation is January 14th, and your estimated ovulation will be December 31st. The fertile period occurs approximately 3 days before ovulation to 1 day after your ovulation, so your fertile period ranges from December 28 to January 1. If you get in touch at any time in the range of fertile periods, then pregnancy can occur. If calculated from the first day of last menstruation, your gestational age on January 27 is around 5-6 weeks (5 weeks 6 days).
Regarding differences in test pack results, there are many factors that influence. The thing that often causes test pack examination results to be false negative (negative results when pregnant) is an examination that is done too fast and also an examination carried out using diluted urine (meaning not using urine first in the morning). Another possible reason is the use of inappropriate tools (such as dipping the inspection tool too fast or reading the results too fast). To ensure your pregnancy, you can do a checkup with your obstetrician when your gestational age has reached 6 weeks (and it is recommended to be examined in the first trimester of your pregnancy).
For now, you should start taking pregnancy vitamins regularly every day. Consumption of pregnancy vitamins is highly recommended to ensure adequate nutrition of you and your baby and prevent birth defects in the baby.
So much information from me, hopefully enough answer