Is It Advisable To Continue Ovacare After Delay In Period?

Hi.. My periods came to 33 to 34 days cycle after taking Ovacare tablet whereas before this it was irregular and around 45 days. Since Nov it is consistent to 33 days. My last period was Jan 17th and attempted to become pregnant around ovulation period and there are pregnancy symptoms till today. Today is 4th day after missed period but HCG test is negative. I stopped taking Ovacare 1 week before the date of Feb 18th fearing that this might lead to periods as this brought my irregularity to 33 days cycle. Kindly advice whether I need to continue with Ovacare now.