It can take anywhere from 4 weeks to 4 months for your periods to get back to a predictable schedule. We do NOT advise using ovulation tracking as your primary method of birth control until you’ve had at least 2 months of predictable cycles. It is possible to get pregnant again before your next period and before your pregnancy test turns negative. Your next period may come anywhere from 2 weeks to 2 months later and is almost always heavier than usual, sometimes by a lot. That is common and will clear on its own.