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You need to understand that even the mild secretion at the tip of the penis which appears when the male is sexually excited WITHOUT ejaculation is also rich in sperm, called Pre-ejaculate
. If you want to prevent pregnancy
, better to use condom or go on the contraceptive
pills under medical advise and supervision. There could be a number of reasons for your missed periods. Go one step at a time. Firstly do a Urine pregnancy test. If negative, consult a Gynaecologist who will examine you and rule out hormonal problems and PCOS which can also cause the similar picture. If you have Hypothyroidism
it could be associated with high Prolactin
levels which can also cause delayed menses. Get your Thyroid levels checked as well and get proper dosing of the Thyroid medication as well.