Changing contract while pregnant will this affect maternity pay?

[user1475169776]

I have just found out I am 8 weeks pregnant and I have 3 jobs atm. I have been employed by jobA for 4 years where I had a contract of 28 hours. I then took on another jobB with a relief contract to do in spare time, usually a few shifts during the month. I then changed jobA contract to a relief contract as I got offered another jobC of 32 hour contract since July. I still work at job A also in my spare time doing a few shifts a month. I wish to leave jobC as I hate it and have been offered my contract of 28 hours back at jobA. Will this affect my maternity pay?