You asked

How do I conceive when over 30?

Although a woman’s fertility begins to decline in their mid- to late-twenties, it is around their 35th birthday that most women start to experience a significant deterioration in their ability to conceive. As there are many women who continue to enjoy the ability to conceive well into their early 40s, many women simply assume they too can reproduce into their 40s. This simply is not the case for all women.
A rough estimate of your future fertility hinges on a few critical issues. Your current menstrual cycles give you a clue into future fertility: if your periods are irregular and significantly painful, this could indicate future problems. If you suffer from a chronic illness such as polycystic ovary syndrome (PCOS), diabetes, or a thyroid disease, this could also complicate fertility for you.
Another marker is the age at which your mother went through menopause. If your mother’s age of menopause onset was early, this could be a red flag for your own fertility.
None of these factors guarantee that you will not be able to conceive. Many women conceive easily despite these factors, but these are factors that do point to risk of increased difficulty.
The only way to know for sure is to begin trying to conceive.
How long should you wait before you seek assistance? If you’ve been trying for six months without success, seek help from a specialist. The first step would be an appointment with a reproductive endocrinologist.
Your fertility expert will rule out hormonal issues or issues with your partner’s fertility. If these are not an issue, there have been many recent scientific advances in fertility which your fertility expert can apply. Often women seeing a fertility expert are pregnant before they know it!
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More questions

The best timing for pregnancy testing is once you miss your period.
Ectopic pregnancies are fertilized eggs which implant themselves outside of the uterus. They must be terminated and can indicate future fertility issues.
Ovulation is the period during which you can conceive. Tracking ovulation can be tricky, but you can increase your chances of conceiving through math, prediction kits, or simple scientific observation.
Implantation bleeding is not a common experience, but some women do report small amounts of blood with or without cramping roughly a week or less before their anticipated period.
Pregnancy tests are only as good as the execution. Read all instructions to avoid getting inaccurate results on a home pregnancy test.
The best over the counter kits measure luteinizing hormone (LH).
There are many things that you can do to increase your chances of getting pregnant.
How STD’s can affect your pregnancy, your baby and how you should deal with them during pregnancy.
Taking care of your body before and during pregnancy
Ovulation occurs just about two weeks after the first day of your period.